Go to a range that rents pistols, & ask them to show you a few. Rent them, shoot them, & research the hell out of what you like. You're going to have to decide for yourself if you want to start out with a revolver, or semi auto. That's where you're going to start. Then it's going to be a matter of what fits you. Then it's going to be what's your budget. Then training with it. Holsters are a whole other thread. What ammo will
you want to carry, again another whole discussion. Look at Ruger, Smith & Wesson, Glock. Great starting points, but not the only thing out there. Good Luck!