welcome to your new obsession! lol Check out the Blue Max Kart Club.
They run a great program in Davis. Anything from shifter classes and tag, yamaha and KPV and Clones. Great bunch of folks. Nothing helps more than to go to a race and talk everyone’s ear off and see what looks good to you. Banging gears on a dirt bike is not much different than a shifter so try to get a couple of different rides before you decide. Have a blast and come to Reno sometime. We have one of the wildest and fun tracks in the west!