www.dfg.ca.gov - find the publications and regulations section... they also have some identification images for commonly misidentified species.
You should pick a few species to target, read up good on them and work only on those. If you catch something you're not sure about, just let 'em go and find out about that species later. It can take time to learn all the different fish species take and size regulations (after 5 years I was still catching stuff I didn't recognize).
There is a paper sportfishing guidebook/regs that is available anywhere you get a license but being able to pull this out and ID a fish on the hook is not really feasible.