Hi and Welcome Mike!
I am a newbie also! I bought a grassroots motorsports mag that featured rallycross four or five years ago... It was something i really wanted to do but didn't have the money to do it. This past year i bought a SVT focus and it brought all those old dreams back to the surface. Almost a year ago in February, I volunteered to work at the event. This past november was my first try at racing. It was AWESOME
Here's a few tips ive already learned.
Try volunteering at an event before driving in one, its free and you could definitely find somebody to ride along with, they even have loaner helmets if you don't have a Snell 95.
If you want to restore your probe, esp. if you have new paint, I think you might find RallyX to be a little rough on the cars. I ultimately bought a different car to use in Rally cross, because i dont want to risk rocks coming up and scratching the paint, or risk it bottoming out.
These two problems; however, could be solved with a good set of mudflaps and a skidplate. There's guys and gals who race fairly new STI's too. One guy protects his paint with masking tape, he just coats the bottom half of the car with it.