New "Admin" Class

Hey, you know in ulx there’s the admin classes admin, superadmin, and superadmin with immunity? How do you create a new class? I want to make a vip class for donators. Also, with darkrp, I wanted to make “VIP” classes, when you make the class there’s a value for 0=everyone can be it, 1=admin, 2=superadmin, how do I make it so 3=vip?