The NRA does many safety classes. I went through two as a kid, one in school (yes school) and another through a "Grange" which is some sort of group that is part of the Methodist Church both before I was 18.
Then buy a .22, they are cheap and ammo is cheap. I used to sit empty pop/sode cans on a board and shoot them until I ran out of bullets, then would wait for dad to buy me another box of bullets and shoot some more. Then once you have put some time behind that .22 you begin to get a feel for what you do and don't like about it and can use that to make a good choice when you look for your bigger gun(s)