help with gmodRP

Well guys i am really quite desperate now, i have completely finished putting in all my weapons and content for my zombieRP server that wil be a modified version of gmodRP, But i have one big problem, that problem is that i need to make some classes admin and respected only because the server will more than likely turn to minge.

if anyone can help me make it so that only admins and respected can acess certain classes it would be much appreciated.

Do a check for admin on the function that switches the vocation.