Your very first game is going to be overwhelming. And that's ok. There's simply too much to get it all right. My advice would be to concentrate on ONE THING that you are going to get right all night. If you can focus on one thing and get one thing right all night, you will be WAYYYYYYY ahead of most first-year guys.
Officiate the whole game (which I understand is impossible
), but keep in mind that ONE THING that you're going to get right all night.
Some suggestions for the ONE THING:
1) Raising your hand and giving a stop-clock signal every time you blow the whistle.
2) Calling the ball out of bounds on the lines that you are responsible for and NOT blowing the whistle for out of bounds calls on your partner's lines.
3) STOPPING at the scorer's table to give a slow, clear report after a foul.
4) Communicating the number of the player who will attempt free throws BEFORE going to the scorer's table.
5) Indicating the throw-in spot to your partner after every (non-shooting) foul or violation.
There are plenty of others, and you've already gotten some other good advice. But I would just pick ONE of these per game this entire season and improve that one aspect of your game. Otherwise, you're biting off more than you can chew.
Have a great game. Let us know how it goes.