Go find a gunshop where you feel comfortable, and pick up as many guns as you find interesting. I'll second the 4" .357 comments, great first gun. Those who prefer autos and high capacity have a valid point too. In the end it's your money, get what you like. If you don't like it, you won't practice, and practice is important. Also do get some training. It doesn't have to be a big drawn out class and it doesn't have to be extremely expensive. My kid's hunter ed class was one of the best all around safety oriented classes I've seen. Bottom line, get what you like, practice, get some instruction. and GOOD LUCK!
.
.
.
.
I usually tell my friends to check out the price of ammo because you will probably spend more on ammo in the life of the gun than the gun itself.
Pick what fits your hand well. Next pick something that has cheaper ammo.