Setup very much depends on user preference and the typr of track you run on.
Much of the whole setup is dependent on the type of the tyres you use. If you have a wrong tyre, it'll be pretty useless to tune other things.
Tires- You should ask fellow r/cers at the track on the selection of tires.
Shocks- It is also recommended that u ask other's opinions if you cant decide. General thumb of rule is smooth/sweeping tracks require heavier shock oil and bumby/technical track require lighter weight oil.
Springs- Same as above. you can vary the front and rear for personal driving style. I prefer an understeering setup(front hard,back soft) as it allows me to enter corners faster and bleed off speed and makes consistent timing for me.
Diff- Still the same theory, high traction heavy weight and inm reverse. Can tune for under/oversteer.
Shock tower postion- This is pretty much later part of tuning and try not to adjust too much if you are unsure.
Camber- usually more neg if your car rolls. i try to adjust till it provides optimum traction and wears quite evenly.
Castor- depends on track. Ask around if unsure
I think that pretty much covers most of the tuning you need to run your car optimally. Im not selfish and below are some extra tips that i think not many people are aware and you can ignore it if you know already.
Tip 1- Soaking belts in WD40 for 24-48 hours makes the belt softer and thus increases efficiency in the drivetrain.
Tip 2- Most V1S users dump the front shock tower and replace it for the small plastic that comes with the package.
Tip 3- Some users find a slight increase in power when they drill about 3 holes in the stock exhaust baffle. This may vary from user to user.
Tell me if i left anything out or if there's any wrong info.