Some of this might really be dictated by your local mechanics, but here are some minor tips.
- First movement should be backwards (run or pass).
- Do not get caught watching the ball.
- When you have GL responsibility, do not be in a big hurry to signal a TD when other officials have other coverage (sideline for example).
- Get involved in Penalty enforcement when you did not throw a flag. Help with a spot coverage or make sure the penalty is being enforced properly.
- Get to the sideline on plays that go out of bounds.
These are just some things, it might be better if you ask specific questions as many of us might not have your mechanics or area philosophy. I am sure many can help with specific plays or coverages.
Peace