Depends on your area. What level ball are you looking into? For larger areas, you have to join an association that schedules games. Out in the sticks where I'm at, you have to call/visit with each school's AD because they all schedule their own officials. Do some research, talk to some guys who are officials in your area. Camps are ALWAYS good to go to; there are some guys here who go every year and they've been officiating forever. (Padgett?
) I have already worked with a guy who was a senior in HS, so no diploma required.
Good luck, have fun!