Jokerman said:
Harry Potter, if you haven't any experience with guns, i would suggest you start off by getting a .22 target pistol ( like the Browning Buck Mark) or a .38 revolver and practicing with it for a while. Then you work your way up. You learn control and aim better that way.
I have to take care of a pesky Consumption of Marijuana warrent first(I assume that would show up on my background check and prevent them from selling me the gun?)

Such as, you ran out of money or the gun shop was closed.