Fish and game in California does not require any special state taxidermy permit, however... you will need a federal license for migratory birds if you plan on doing them. If you search "taxidermy" on the California fish and game web site they will have a list for what can and can't be bought and sold in California. Also, consider joining the state taxidermy association...very helpful!
Try giving Chuck a call at Ojai Valley Taxidermy. He's about 20 minutes from you and will be a big help.I don't have his number, He is listed.
Hope to see you in Sac this year.