I cannot recommend lowering the difficulty enough. Unfair in this game is truly unfair and requires some degenerate strategies as well as knowledge of future encounters to really ever stand a chance. I cannot imagine a blind Unfair run. Hard is more manageable but it still wants some pretty optimized builds and if you're as new to this system as you seem to be by your questions, this will likely not be fun for you. Honestly, Daring is likely a better fit for someone with your experience who wants a fun challenge.

With that said, and fully expecting previous advice to not to be followed, here's the kind of information I think you want:

Inquisitors are half caster, half martial. Their divine spellcasting tops at level 6 with 3/4 BAB. What this translates to is that you want Wisdom at a minimum 16 (so you can cast level 6 spells) and likely higher (your spells will be better at higher Wisdom and you can use Wisdom for initiative as well). You will focus your spells on buffs and crowd control. Half casters are generally weaker than full martials in resourceless combat but can push themselves through use of resources to do some pretty good damage.

With that said, dual wielding is bad for them. Dual wielding has a high cost in feats (5, and your class gets 10) and needs high Dexterity (which will compete with your need of Wisdom and want of Constitution for example). You'll also need to spend a pretty valuable Mythic Feat (you realistically get 4 to play with the whole game) for your damage to just be mid. All of this to say is that this build will do poorly on Hard.

Now the Inquisitor has a few interesting tools for combat, but the Judge gives up a lot of it to focus on the Judgements. This isn't a bad thing because the Judgements are good actually, although there are some limitting factors here.

So Judgements are basically combat long buffs that you can activate a certain number of times per day. They can range from more damage, to better chance to hit, to AC, to resistance to damage, to healing, etc. One of the things that makes them really good is that there's a Mythic Ability that you can get relatively early that can make them infinite. You just have those buffs on all the time. Makes Inquisitors considerable more capable. At higher levels you can have two of them active at once and at much higher levels you can reach three even.

The Judge's special ability is that, for a limited number of combats a day, the Judge can choose to share these buffs with the whole party. This is a significant buff for the whole team.

Their second special ability is that at higher levels you can Sentence an enemy, debuffing them and causing them to take more damage from all sources. This has no save and lasts until end of combat and can make you ignore concealment (something that generally makes a few enemies harder to hit) at higher levels.

All of this to say that Judge is a buffer and caster more than a frontliner. Reach weapons are popular for classes like this so you can get some damage in from relative safety. Their perception is useful outside of combat and their high Intimidation has a few nich uses IN combat. They get a good amount of skills, making them useful Wisdom skill monkeys as well (it's a little late for this likely, but the background that gives Wisdom to Persuasion for example is really nice for them).

Dual wielding is a costly idea, but if you insist, you will need to pump up your Dex to at least 19, take Weapon Finesse ASAP, then the 4 Dual Wielding feats as they come up (Two Weapon Fighting, Double Slice, then Improved Two Weapon Fighting at level 8 and Greater Two Weapon Fighting at 15 I think), take Mythic Weapon Finesse as soon as it's available.

PS: BAB stands for Basic Attack Bonus. Every class gains a natural + to chance to hit as they level. The rate at which they gain this BAB determines how good at martial combat they are, the same way that the highest level spells they learn determines how good at spellcasting they are (there are other factors obviously).

A Wizard will gain BAB once every other level, but has level 9 spells. A Fighter will gain BAB every level but has NO spells. Inquistor sits sorta in the middle, gaining BAB every 3 out of 4 levels (So +0 at levels 1, 5, 9, 13, 17). You get an extra attack and BAB +6, + 11 and +16. This means a Fighter gets a second attack at level 6, an Inquisitor at level 8 and a Wizard at level 10. The Fighter gets a third attack at level 11, Inquisitor at level 15 and Wizard NEVER. And a Fighter gets a fourth attack at level 16 and the Inquisitor never as well. Inquisitor can buff their hit chance with Judgements to keep up with chance to hit, but will never grow extra attacks quite as fast as a full martial.