I think others have said it, but I also recommend going to a range and renting a few pistols after handling some and seeing if you like them. Honestly, to me, a 9mm pistol is a 9mm pistol unless the models are quite different. But I'm probably less sensitive to grip angle and controls and that sort of thing.
Since you're left handed I'd recommend a pistol that has ambidextrous controls but you could get by without them, I'd think. It's all a matter of practice/training with the pistol.
Here's some I'd recommend:
- SIG P226 (you could get a used one for ~$700, that's what I did, though mine's a .40 S&W)
- H&K VP9
- Walther PPQ
- Springfield XDm (I have the older XD model and these pistols have their detractors, but I think they're decent, and especially high value)
- Glock 17/19 (not everyone likes these but I'd recommend renting one if handling one doesn't completely turn you off; they're just so popular, have never-ending accessories/support, and are incredibly reliable)
That's probably a decent starter list but feel free to pick out whatever floats your boat. I'd stay away from any 9mm 1911s for now (anyway to me these are .45 ACP or bust anyway) too.
For buying the pistol, I'd handle them at whatever gun store(s) and if you don't care, you could buy it online and of course you have it shipped to a local FFL and pay a transfer fee (usually between $25-$50) and fill out paperwork when they call you and you go and pick it up. For some sites to buy from:
-
AIM Surplus
-
Bud's Gun Shop
-
Impact Guns
Hope that helps. Feel free to ask any other questions or PM me. Guns are fun and your first one will almost certainly not be your last, haha.