I just made a large post on the "Novice Guide to Autocrss" sticky with the most important things I learned at the school. Take a look and let me know what you think or if you have a question about it.
May be a little advanced for a Novice Guide, but it's all good habits to learn early!
Don't waste another minute waiting on parts, or anything else. Just get out there and start racing! You will suck at first, and you will be slower than many other cars, but the only thing you will regret is not starting earlier...