Take your time! your first run, you need to learn the track and the car.
Sometimes granny shifting is better than spinning through all your gears.
Leave your ego at home, its for fun, dont hurt people or yourself by trying to show your ass.
If your on the bottle, purge at least 4 times before a run (personal oppinion).
If your running a wet nitrous system, check for fuel pooling if you miss a gear while spraying.
GET OFF THE CLUTCH during a burnout! Unless you really want that walk of shame
I'll add some other things as I think of them