Quite honestly, we and you need more information to make an educated decision.
1. Do you plan on carrying it?
2. Do you just want to learn to shoot it?
3. Personal/Home Defese possibilities?
I would always recommend a good .22lr semi-auto or revolver. Ruger's 22/45 is great, fun, and cheap to shoot. Good .22's aren't that much cheaper than larger caliber handguns, but the saying goes "splurge on the weapon, save on the ammo". That being said a good .22lr handgun in a training tool that every shooter should have and reap the benefits from. I'd recommend picking one up. It is a decision that very few shooters will ever regret.
Also, if you are considering criminal justice as a career (possibly law enforcement) there are quite often unbeatable deals given to rookie officers looking to purchase their duty weapon(s). I'd wait to get me Glock/xD/M&P. Unless you take off like a greased-lightning and go a bit handgun crazy. Then get whatever you'd like and more power to you.
Good recommendations for green shooters.
.22lr-
Semi-Auto- *transferable battery of arms to a duty weapon (magazine loading, presentation, malfunction control, maintenance, etc...)
Ruger MK II / MK III series with good sights. Used will do just fine. $300-400
Walther P22- You'll want to get a factory new one due to quality issues and warranty. $300-400
Browning Buckmark- $300-400
Smith and Wesson 22A- $250-350
Revolver- *simple battery of arms (low maintenance necessary, simple to use, very durable/versatile)
Ruger Single-Six- $450-550
Taurus M94 9shot (adjustable sights)- $350
Heritage Rough Rider- $200-300
If you are looking for something a little larger or are looking to get a service weapon that can evolve with you future profession, then let us know so that we can adjust our advice accordingly.
Hope this helps,
~LT