Well, We could start out with the most obvious one, No abusing your powers or commands. Or whatever the hell you want to call them (:
No asking for Admin, You'll waste your time asking..Just work hard and you'll eventually rise up in the ranks.
You don't work hard for nothing (:
No Profanity on the servers, You'll be setting a bad example of CM by mocking here and there, and making a fool out of yourself. I surely know that some of the members will have quite a temper, but remember, it's just a game (: .
I'll write more suggestions later, I'm not thinking straight now O: