Welcome! And good luck in finding THE bus that's right for you. Definitely cast a wide net!
Given CA's progressive stance on emissions control, you'd do well looking to the north, and several states over, eastward, before you buy.
Plenty of threads on the forum covering which states and auctions to suss out.
Itemize your planned utilization. If you're staying in the flatlands you'll have more options than if you expect to be mountain climbing! Again, plenty enough threads here on engine/tranny/body style. Time to start studying...
Welcome to the asylum!
Those who say that it cannot be done should not interrupt the people doing it.