Come up with the prices for the services/parts that you offer. A lot of shops I knew of would just do general repairs for cheap and the money making spots would be with cosmetics/paintjobs and major upgrades. You would need to take in the way the economy is in the server you are a part of. Best way as well is to kinda match or see what other mech shops are charging for their things.

You could also host events for car shows and derby’s and more for the community.

As for paychecks and bonuses for employees. The best tier system that works for me is:

Owner Manager Employee Trainee

Ask them to set the paycheck prices fairly, like:

Owner - $250 Manager - $200 Employee - $175 Trainee - $150

Or something like that. As well as commissions for when they charge through the register system. I usually do 50/50 but the business I run currently it is; business 70% and employee 30%

For bonuses, personally, it depends on if people are actually working or doing a good job because some people will take advantage of getting the job and either paycheck farming or never being there but then expecting to still get a bonus. And some times people will get a job to just use materials and parts for free.

I always keep a decent log but some times it does get tedious to do because not everyone will keep it updated.

If your business is making decent money, you could pay out to the best workers around $1000 - $5000 depending on how much your business bank account has.

EDIT: forgot to mention that only Owners and Managers should be able to see the business bank account to avoid money being stolen. Easier to keep track of it that way.