To create a course page or sign on as an ambassador, you'll need the campus volunteer and/or online volunteer right for your Wikipedia account. (If you go to Special:CampusAmbassadorProfile or Special:OnlineAmbassadorProfile and don't get an error message, then your account already has the necessary rights.)
If you don't already have them, you should now request the right(s) you need by posting on the education noticeboard. Describe your Wikipedia editing experience, and if you're going to be a campus ambassador, tell us about which class(es) you are planning to work with and where you are based.
After you've posted your rights request, return here to continue.