nine,
Helping out at the scorers table is a good way. I would just avoid and complaining opened questions, like "that was a terrible call, hey nine, what did you seriously think about that?" Other than that, just watch the game and have fun. Also remember, Fresh/Soph boys ball is hard to call, so keep that in mind whenever you aren't seeing everything called. Chances are the official saw it, but you can't call everything at this level!