I'll tell you what I tell everyone, and it's the best advice you'll get.
Your first handgun purchase should be a .22. You'll be able to shoot thousands and thousands of rounds for dirt cheap. You'll master handgun shooting very quickly (weeks), and you'll be rubbing shoulders with lots of people with different guns, most of whom will have no problem letting you examine or even shoot them.
Only then, as an experienced shooter, step up to the centerfire handguns. You'll be starting out as a competent shooter with an experience basis to choose the best handgun for you. Handguns differ wildly in ergonomics, trigger types, recoil levels, etc.