It's pretty simple. You show up to your event.
If you want to run novice, you do (in whatever class the car would class in for open).
There are actually 2 "novice" classes. Novice "stock" and Novice "modified". SS-HS are in Novice Stock. SP, P, M, and the ST classes are in Novice modified. At the end of the event, the results are paxed for each of the 2 classes. Trophies are awarded, as are year end points. At then end of the year, the members who qualify for a year end trophy (using the 1 for 3, 2 for 4, 3 for 7 rule) get a year-end trophy and everyone moves on to the open classes (though I believe there is a cutoff where if you start AFTER x date, you can run another year in novice).
I'm not sure as to the reason for the 2 novice classes... might be sheer numbers, might be better "comparability" of raw times. I haven't asked.
Novices all run with their class so they can get to know others with similar cars, and get help, advice, etc. (Up here people seem to grid by class. it's not a rule, and the grid guys don't make it happen, it just seems to on it's own.)
We have no tire class, no pro class. It's an SCCA club and we pretty much stick to the book. You run your regular class either in novice or in open class. If you want to run ladies, you run CSL, or EPL, etc. Not a paxed class. They don't even bump up here. Keeps things really simple for results.
If anyone wants me to get more info from our Novice chair, I'd be happy to.