Normally you would just order spores online and grow them yourself (it's trivial if you're not trying to maximize output, just takes time and some attention), but sadly that's not legal in Idaho/Georgia/California. Not sure what other options are available in CA as far as growing goes. As for the rest, I've found a lot of helpful info on /r/shrooms and shroomery.org. Sometimes people can give conflicting advice, but as with all things it's best to synthesize from multiple sources and figure out what works for you. Start small and be careful.