[Jamo]

Sal, I've autocrossed for nearly thirty years and I always recommend that folks do it before anything else. You will learn more about your car and what it likes and doesn't like in relative safety and without an unreasonable chance of breaking something.

Couple of things. The Billboards are NOT autocross tires, and will put you in a much higher class (non-DOT) than you'll want to be in per SCCA Solo II rules. They will not warm quickly as autocross compounds are designed to do. Go ahead and start with them for a few events if you want, but beyond that, start thinking about Hoosier TDs (bias) if you're using 15" wheels, or a variety of radial autocross tires from several mfgs if you grab a set of 17" wheels. They need to be DOT to put you in the right class. You should be able to google a local SCCA chapter near you for autocross events. Be sure you read the applicable rules, and pay attention to safety requirements so you won't be turned away at the grid...double throttle return springs, tight wheel bearings, battery secure, no loose items in the passenger compartment or the trunk, etc.

When it comes time for open track, follow the advice given above and get thyself to a school first. Some clubs with open track days will have a senior driver or an instructor available for newbies (not instead of school!) and you'll be grouped in a beginner class. Might not be a real bad idea to go out there in a Mustang first. The Cobra can and will bite your ass without mercy...better to learn what the track looks and feels like in something a bit more forgiving and get a feel for what it's like being around other drivers on the track.

Just go for it. If you don't like it...stop.