Good advice.
I'll add if you're running on your stock tires, increase your pressures to around 45 or so.
Walk the course a lot. Memorize it.
Start out slow and work your way up....people who try to go too fast right on the first run usually have a harder time backing it down later.
Slow in = fast out. Too much entry speed into your corners usually end up costing way more time than if you simply slow down to begin with. Slow enough to set up your exits. More throttle on exits = better times even if you have to slow your entrances.
Talk to other fast guys...thye are usually willing to help noobs in the learning process. Have someone walk the course with you.
Don't get discouraged when you get beat up on by a fast guy in a rusty Civic! 
Here's a link to a greta Novice Handbook:
http://www.tirerack.com/features/solo2/handbook.htm
Most of all have fun!!
Pat Washburn
Wausau, WI
1995 525iT