There's new information if you Google "club motorsports, Tamworth, NH". They've squeezed a lot of curving asphalt into a relatively small area of Tamworth. They start operations this September.
They describe the course as "heart-pounding", and I'd agree with that assessment if they
haven't made improvements using standard race-track safety features. .
Last year's videos show a newly-paved track, but scant attention to safety. I hope that's been attended to.
I've trained race car drivers on dozens of race tracks, but never seen where a moment's distraction could put you into the face of 200 feet of granite!
You'll need "track" tires and some real-time instruction. You don't want your Corvette passed by 4-cylinder passenger cars!
Don't know if they require helmets, but "BMW-CCA" track events will, and their beginner's "Teen Survival" course is an excellent place to start.
Like Tres Martin's school for boaters, such education will open your eyes.