Donuts first!

Welcome to the forum!
Your level determines how many court members join in the fight. You can bring 10 times your level (lvl x 10 = max # of court members). Whenever you buy equipment you will see a number under the word "MAX" which lets you know how many more of an item you need to buy to equip all your members that are eligible to fight (i.e. you may have more than the max # of members but buying the extra equipment will not help because they cannot join in the fight).
So at level 10 you can have 100 members (and corresponding equipment - weapons, armor & vehicles) in a fight. At level 20 it's 200 members, etc...