Probably your best bet is to go out with the BMW or Porsche clubs, as they allow any car in, and have open track and driver education days. They are also pretty cheap, especially when you consider many good schools can cost upwards of $3000.
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...