Pretty much was Bowguy said, keep it close, and keep it fun. Make up some games to play shooting at targets. Tic tac toe is a good one if you have a bigger target to shoot at. Both my daughters started out shooting a little red fiberglass bear bow, with a piece of binder twine from a hay bale for a string. I made them arrows out of old broken shafts of mine, and as they grew older, I upgraded them in bows and arrows. I took them with me as much as I could and as they wanted to go. My youngest was 3 when I came home with a double ladder stand for us to sit in, it was 15' to the platform, and she climbed it fearlessly. I was always right behind her in case she slipped, and got her all strapped in with her harness once we were up. My oldest didn't like and still doesn't like heights, so we would sit in tents. Also, be ready to leave when they are, even if it's just getting to prime time. I always tried to keep it fun for them as much as I could, and they still both love to hunt and shoot bows when they have time.
Jason