First, welcome to the forums- and condolences on the loss of your father.
I am not a Californian, and know just enough of CA gun regs to be really and truly dangerous. The CA DOJ has a listing by make and model of handguns that may leglly be sold in CA as of 1-1-2001. Click HERE: Roster of Handguns Certified for Sale - Firearms Division - California Dept. of Justice - Office of the Attorney General
There ARE some versions of the 325 and the M&P45 that ARE on the approved list. CA does have requirements for registration of SOME firearms- I am going to suggest you find a local gun that you can talk with- give us your zip code, and I can probably find someone close to your area.
Selling- couple of things to consider- First. so long as they are on the CA DOJ list, you can sell a handgun to another resident of your home state, OR to a licensed dealer in ANY state. There are internet firearm auction sites (gunbroker.com, auctionarms.com, gunsamerica.com) where you can put up for auction, when sold you ship to a dealer in the buyer's home state. SHIPPPING a handgun will cost you about $70, so think about that. You can also sell to a dealer in CA (expect to get 50-60% of the Blue Book value, depending on condition, box, etc- dealer has to make a profit) Some dealers will also take a firearm to sell on consignment- they sell, keep 10-% of sale price,
Shotgun? Firearms have a different legal meaning when you use word antique. Either a muzzleloading (black powder) OR made prior to 1899. YES, we need pitchers. Can't tell a thing without pitchers.