Remember to watch for your competitor as you look to turn on to the return road. On the return road, stop at the little shack and pick up your timeslip. Remember not to speed, burnout, or drive in an unsafe manner or you'll be asked to leave. Know what your car needs, know the rules, know the track layout and listen to the PA Announcements at the track. Smart racers will usually attend one race before they try to race themselves to study the flow.
Preparation is the key to enjoyment.
If you're still having difficulty, ISDS has a info number published so you can call for answers on specific questions regarding the car's technical requirements.