this comes from experience. high schoolers (in large part) bring too much drama and "mommy & daddy wont let me do this or that to my ride " "mommy and daddy wont let me go to this show".....etc. Set up some bylaws to begin with. dont wait till later on to start making rules. here is a link to my clubs bylaws to give you some ideas.
http://www.kausinkomotion.com/bylaws.htm