Simply head over to scca.org find a local region's website and just show up for the next event. Take along a good tire pressure gauge, a notepad, and a camera for good measure. Don't let anyone tell you that you can't auto-x an ATX, I drove an ATX Cutlass for two years and had a blast every time--that's what it's all about!
Oh, and don't worry about wear and tear. Typically, you'll lose a couple hundred miles of tire and brake wear. Big whoop.
