Also, inflate your tires to their maximum PSI and when you get there, ask people with similar sized/weight cars what their running front and rear; then let out as much air as you need . Of course the problem is, you want to take those pressures when the tires are cold so see stealthx32 FIRST bullet point.
Typically, for our cars, the fronts should have a higher psi than the rear. For example, on the high-performance tires I had once, it was 44 front, 40 rear. Keep in mind, I was running a stiff rear sway bar so I was trying to "balance" the car a bit more (read fine tune).
IF possible, after getting there early and registration is done, try to HELP setup the track; this gives you more time to walk the track before everyone else walks the track. I even got to ride shotgun on a track because everyone felt the course was "too fast" (trying for max. of 40mph) so I sat along with my helmet on and let this guy in a Jetta do his hot-lap; we hit 50-55mph on the stretch in question so we modified it to cut the speed. But it gave me a REAL good idea of how the track would be during a test drive.
Regardless, I found that if you bring a notebook (and you may see other do this too), and draw the track as you walk it, making note of the hairpins, sweepers, S's. During the wait, go over how you'll drive your line through the course. Some verterans may even help you out and explain how you "should" take the turn or how to setup out of one turn and into the next.
No matter what, we never do well on our very first AutoX as there are so many factors that vary from day-to-day, track-to-track, but the fun is going over and over again, gaining new knowledge and experience.
Good luck and let us know how it goes.