Know the penalty enforcement procedures by heart.
You will almost never blow your whistle (I use mine MAYBE once a game); use your voice constantly, let the players know you're around. Short, simple phrases like "That's it" or "Play's over" or "easy up" will help you out tremendously.
Your white-hat is the captain of the crew, you're the executive officer. Your job is to make your white-hat look good. In pregame, ask him what you can do to help him out, and then do it.
When a runner comes straight at you, the worst thing you can do is move backwards (the runner will keep running right at you, because now you're lead-blocking for him). Learn to hold your position and make the runner move around you.
Invest in a couple of good knee braces.
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