Yeah, I got a shit load of suggestions for newbies....

1) Come EARLY for your first few events. Walk the course as many times as you can. Even better, find an experienced person and walk with them... they can point out how different sections "flow"

2) Add more air to your tires. Street pressures are not autox pressures (unless you are like me and put an amazing 2000 miles on your car last year and only drive it at autocrosses).

3) Mark the side walls of your tires at 3 or 4 places.. This will tell you if the tires are rolling on to the side wall.

4) Bring a pressure gauge. Once you've gotten your pressures about right, you will not have to divate much from them unless you make other changes to the car.

5) You'll be there a while. Dress correctly and bring water/drinks. You will be REQUIRED to work after you run. Working is easy, but this is a volunteer sport so helping out is mandatory.

6) Talk to people or ride with people if possible. Autocrosses tend to be very nice people and are willing to help you out.

7) Clean the shit out of your car. Litterally, and I don't mean wash and wax it. You don't want stuff flying around..

That's all I can think of right now, I'm going back to researching porsches, I need a new toy..