Find a good teacher, as I found for my sons. I feel the worst thing you can do is to try and teach your own children yourself, because there is a natural rebellion that occurs.
People are always saying that I must have been the class clown, with all these voices. No, I was way too shy to be the class clown; I was a class clown's writer.
My mom would give me a piece to play, but I wouldn't do any theory because when it came time to do it I would sneak back upstairs and watch TV. So, I had these kind of nonchalant lessons for years, then it just started soaking in.