WarPig1976's advice is quite sound for two handed shooting, but you might want to go "old school" as well. Here's some basic WWII techniques, courtesy of Badger:
Combat Firing with Hand Guns (Department of Defense 1944)
But those folks would get quick DQs for allowing their off-hands to pass in front of the pistol's muzzle whilst drawing!
ETA: if you can't get the video to run, just go to the top sticky thread in this forum.