I'd suggest trying a number of quality 9mm handguns - pistols like the Browning Hi Power, Beretta 92, Glock 17/19/26/34, and CZ-75 - not some off brand just beacause it's cheap. A cheap POS will annoy long after the savings are forgotten.
Then determine which one is most "pointable" in YOUR hands.
To do this, pick up the pistol in one hand, focus your eyes on some target, close your eyes, and then raise the pistol to eye level until you think it's pointing at the target. Then open your eyes - how closely are the sights aligned?
Do this several times, and buy the one which is the most "natural" pointer for you.
Since CA currently has a 10-rd limit, you might check to see which grandfathered magazines you stocked up on before CA's 10-round mag limit was imposed . . . LOTS of people bought magazines for guns they didn't even have when they saw a mag ban coming down the road . . . sometimes, before they were even old enough to buy the gun themselves. You may have, too.
On the 9mm vs. .45 debate . . . I have several examples of each. I recommend 9mm as a first centerfire primarily because decent practice ammo is cheap. (Locally, WWB is under $5/box, and Blazer is under $4.)