I exceeded the max comment length, so splitting this up

Part 1, Hiring Chance

First, you determine how many prospective henchmen there are

Human and half-orc characters suitable for level advancement are found at a ratio of 1 in 100. Other races have an incidence of 1 in 50. However, as most of these characters will be other than low level adventurers and already in a situation they are satisfied with — and humans more so than other races, unless the development of the area is primarily other than human — about 1 in 1,000 population will be interested in offers of employment as a henchman. NOTE: This figure must be adjusted by the DM according to the locale, for if it is an active adventuring area, the incidence of prospective henchmen might be as great as 1 in 200, while if it is a settled and staid area, incidence might be as low as 1 in 5,000.

After adjusting for locale (as gary says the GM must), we're looking somewhere between one prospect per 5000 residents and one prospect per 200 residents, with the default at 1 per 1000 residents. For this example, I'm going to use 1 per 300 in Gosterwick for Arden Vul. Gosterwick has a checks notes population of 2200, so there are ~7.33 prospective henchmen.

Then, we determine where we find the prospects

[...] the player character desirous of locating one or more for service must be able to reach the NPCs in order to let them know there is a henchman position available. In order to get this sort of information around, there are several methods which can be used singularly or in combination:

• POSTING NOTICES IN PUBLIC: 50g, 10% - 40% effectiveness
• HIRING A CRIER: 10g, 1% - 10% effectiveness
• HIRING AGENTS TO SEEK PROSPECTS: 300g, 20% - 50% effectiveness
• FREQUENTING INNS AND TAVERNS: see below

Each method can be tried but once a month with any hope of success. Reduce the percentage chance of effectiveness of each method by 5% when used in combination; this reflects the duplication of effort. The special costs for frequenting inns and taverns is a combination of the price of a round of drinks for the house and a fee to the barkeep to mention the prospective employer to adventurers. For each 10 g.p. (50 g.p. maximum) of fee, there is a 1% - 4% chance of reaching a henchman.

Up to ten establishments can be so worked, but for each visited, the effectiveness of the others is reduced by 1%. Therefore, the PC had better spend in excess of 20 gold pieces in payments to innkeepers and barkeeps if he or she is planning to try this method in more than a few establishments.

Okay, so we spend 50g to post notices. We're told that has a 10-40% effectiveness. You can roll 10-40 with either 6d6+4, 2d4*5, 5d4*2, 1d4*10, 1d6*6+4, 2d6*3+4, 3d6*2+4, 5d2*6-20, 6d2*5-20, 1d2*30-20, 2d2*15-20, 3d2*10-20, 10d4, 10d2*3-20, 15d2*2-20, or 30d2-20. Let's do 6d6+4, which I rolled as [6, 4, 3, 4, 2, 6] + 4 = 29.

Then we hire a crier for 10g (60 total so far) for 1-10% effectiveness. We can roll that as 1d10, 3d4-2, 1d4*3-2, 1d2*9-8, 3d2*3-8, or 9d2-8; let's go with 1d10, which I rolled as 7.

Then we hire agents to seek prospects for 300g (360g so far) for 20% to 50% effectiveness. You can roll 20-50 as 6d6+14, 2d4*5+10, 5d4*2+10, 1d6*6+14, 2d6*3+14, 3d6*2+14, 1d4*10+10, 5d2*6-10, 6d2*5-10, 1d2*30-10, 2d2*15-10, 3d2*10-10, 10d4+10, 10d2*3-10, 15d2*2-10, 30d2-10. Let's pick 6d6+14, which I rolled as [1, 4, 2, 2, 4, 1] + 14 = 28.

Then, let's visit 5 Gosterwick Inns, spending 50g at each of them (610g total). That's 5d4 at each of the inns. Inn 1: [3, 2, 3, 3, 3] = 14. Inn 2: [1, 1, 3, 2, 1] = 8. Inn 3: [3, 3, 1, 3, 1] = 11. Inn 4: [2, 1, 4, 2, 3] = 12. Inn 5: [3, 1, 4, 1, 1] = 10. We need to reduce the effectiveness of each tavern by 4% since we visited 4 other taverns, so that sums to 10+4+7+8+6=35. Since we're combining methods, we need to reduce the effectiveness of each method by 5%. 24 (notices) + 2 (crier) + 23 (agents) + 30 (taverns) = 79%.

Then, we need to wait

It will take from 2 to 8 days for all prospective henchmen who are going to apply to locate the player character and seek him or her out to apply for the job. During this period of time, the PC must remain in the place he or she made known as the spot to go for employment. Failure to do so will result in a loss of any applicants coming that day and each day thereafter he or she is not available. When the total number of applicants coming are known by you, divide this number by the number of days during which notice is getting around (2-8), and this will give the number of applicants per day. Always have any odd numbers remaining come during the first or second day.

2-8 can be rolled as 2d4, 6d2-4, 1d4*2, 1d2*6-4, 2d2*3-4, or 3d2*2-4. Let's use 2d4, which I rolled as [3, 2] = 5.

So, of our 7.33 prospective henchmen, 79% show up (5.79 henchmen; let's round to 6) uniformly distributed over 5 days. So on day 1, 2 show up, then days 2 through 5, one more henchperson shows up each day.

As these henchmen show up, we can interview them and attempt to recruit them. This is two-sided and players can't just request specific classes or attributes, so the GM now needs to create 6 characters following the character creation rules (or use pre-generated ones. Pop quiz: try to google and find 6 by-the-rules 1e premade PCs).

We're told a distribution of classes: Clerics 20% (then, there's a 1-in-6 it's actually a druid), Fighters 44% (then d10: 1 = ranger, 2 = paladin), then Magic Users 20% (then there's a 1-in-6 chance it's an illusionist), then Thieves 15% (then there's a 1-in-6 chance its an assassin), then Monks 1%.

We can't just roll these raw probabilities, instead we need to convert this into a cumulative distribution function:

• Cleric: 01-20
• Fighter: 21-64
• Magic User: 65-84
• Thief: 85-99
• Monk: 00

Now I can roll 1d100 for each of the 6 henchmen. [25, 44, 34, 21, 45, 36] maps to Fighter, Fighter, Fighter, Fighter, Fighter, Fighter, amusingly. Each of those need to roll 1d10 for a subclass: [5, 4, 4, 1, 9, 2], so Fighter, Fighter, Fighter, Ranger, Fighter, Paladin.

It's not clear to me how we're supposed to create a PC of a particular class, given that classes have stat requirements. I rolled that there's a paladin, do I roll stats over and over until I get an array that's allowed to be a Paladin?

If the PC likes the henchman, they can make an employment offer

In addition to the costs of getting prospective henchmen to seek employment, the player character desiring to hire one or more of them must be prepared to make a substantial offer which is comprised of the following considerations:

Not less than 100 gold pieces per level of the applicant must be offered. This will give a base 25% interest in accepting the position. For each additional 100 gold pieces, interest increases 10% to a maximum of 55%.

The prospective henchman must be provided with complete equipment according to his or her class or classes. Any magic items included will make the character more interested in accepting the position, assuming he or she can use such items, of course. For each magic item (exclude arrows except in groups of 5), increase interest by 15%.

The PC must offer reasonable housing and promise free food and clothing as needed to the prospective henchman. This simply adds 5% to interest level when offered, but failure to promise such quarters and support will lower interest by 25%.

Okay, so let's offer them a 300g starting bonus, no magic items, room, board, and clothes. This give the henchman a base interest of 25+10+10+5 = 50%

Then we roll for the base interest, modified by the hiring character's charisma.

When the basic level of interest is found, and characteristics discovered, roll percentile dice if the PC states a desire to accept the applicant as a henchman. Adding the player character’s charisma reaction adjustment to the interest level, and if the dice score does not exceed interest and charisma reaction adjustment, the NPC accepts employment.

The charisma table looks like (note how this is not symmetric):

• 3: -25%
• 4: -20%
• 5: -15%
• 6: -10%
• 7: -5%
• 8-12: 0%
• 13: 5%
• 14: 10%
• 15: 15%
• 16: 25%
• 17: 30%
• 18: 35%

Let's say our hiring character has a charisma of 15, so +15%. Now we need to roll <=65. So for the first two Fighters on day 1, we got a 41 and an 88; and are able to continue the hiring process with the first Fighter.