Originally Posted by
psalms144.1
Believe it or not, that helps a lot. In that case I'd get a P320 Compact upper, and you're in business. Alternatively, go whole hog and get a P320 subcompact, and you'll have a very tidy 12 shot package for carry.
As a side note, if you're a new shooter, you should start with basics, and stay close. 3-5-7 yard accuracy drills that allow you to diagnose problems with the fundamentals are likely to be more beneficial than shooting at 15 yards. I'd recommend Dot Torture as a starter, as it will allow you in a series of discreet drills to see what areas are causing you problems (if you have any!)
Best of luck!