We have plenty of noob friendly classes. Hopefully motor tech stays put, where it is, for a while.
17.5 12th scale really isn't too bad on bigger tracks.
WGTR is nice and slow. The only major issue is some cars are brilliant, some are duds. Can be a bit frustrating. But still a great feeder class to 12th scale.
Nascar and tt02 are cheap easy fun. If your track can run them.