Great advice by all...BUT, something you can do to improve yourself has nothing to do with what YOU do on the court.
It has to do with
Veteran Officials!
Go to a Varsity Game, watch the Veterans work.
You will pick up a whole lot of "stuff" that you never even thought of as a fan watching the game.
* Court coverage
* Mechanics
* Dead ball positioning (where the officials stand, etc.)
* How to "look" confident in your calls
* Hustle (or lack of)
* Free Throw administration
* Time out administration
* Handling Coaches and Players
There is a whole host of information you can get just by going to a game and watching the Vets. Also, go in the locker room at half time and just listen. Hear what the Vets are talking about...heck, they might even ask you your opinion on a play. (BTW, don't go in the locker room spouting off that they missed something...go in there to learn.)
Good Luck!
Dude