Correct way to shoot a basketball?

Well the way I shoot at least is I have my index finger lined up with the middle of the ball with the other hand to just hold it there. I can see when I shoot that the ball kind of has a little wobble, as in it doesn't spin perfectly straight. Also I can always tell that the ball comes off of my middle and ring finger most of the time, not my index. Maybe it doesn't even matter about these things and its all what's comfortable to you. But if it does matter, how could I help this?