Sneaky,
Welcome to SCH...I'm going to assume a couple of things...You've taken your Hunter's Safety Course and you have a hunting license with all necessary validations.
Read your hunting regulations backwards & forwards for both upland & big game...You can due this online...(Just type in D-13)...Next invest in OnX Hunts...It's an app that shows public and private lands...Since you'll mostly be hunting the Los Padres NF...It's imperative that you know where your at...OnX also shows water sources, springs, rivers, ponds, etc...In this dry country, all animals will frequent these places...You can also E-Scout on OnX...It will show terrain, access roads, and boundaries.
All of California is non-lead...So, your rifle has to be copper and your shotgun needs to be steel or another non lead pellet...You didn't say much about your shotgun...Pump, semi auto, OU, SBS...If it's a pump or semi, it should have a modified choke...Do NOT shoot steel thru a full choke...Your shotgun should have a good sling...Your .308 has a bunch of options for deer ammo...Ask that questions under Big Game thread or General discussion...A lot of guys can answer that better than me.
For upland...Which would include, quail, dove, band-tailed pigeons, rabbits, etc,...You will need a vest or game and shell belt...Good boots, camo for dove or pigeons, but not necessary for quail or rabbits...Blaze orange is actually a good idea for quail and flushing birds...On short walks, a single bottle of water will suffice...Longer walks for something like mountain quail, you may want a little more.
This is only a fraction of "Stuff" you can get...Shoot both your guns as often as you can afford (shells are expensive and hard to find)...Same goes for your bow...Which really costs little.
YouTube is your friend...Lots of videos out there that could help you in your particular area....Good luck