Go to the MHSAA website at
http://www.mhsaa.com/resources/official.htm. Click on "Approved Officials' Associations" and you'll find a listing with contact numbers. Join the one where you're gonna be reffing at, whether where you live and will ref after graduation, or join the one nearest your college. Even if you have to join another association later after you graduate, it will be helpful for you to attend the meetings and get your name known in an association. If you're from southwestern Michigan, let me know. I'll give you the number of exactly whom to call.