Marcodo I would not recomend you buy a used gun as you have not been at it long enough to tell if it's a lemon or a good pistol. Do you know how to run a safty check on that model of pistol? Just because they go bang doesn't mean they are safe.
Get a new pistol and take a course on shooting. Go to a gun club, shooting range or contact the NRA in your area. They have classes. Good luck.