Baws, I have succeeded as a father. Now I need pointers as to not ruin it

My girl is 8. I took her fishing the first time 4 years ago. We don't go as often as either of us like to, but she enjoys it. Even if she hasn't really caught anything. At Wal-Mart last night, she was looking at fishing rods, knowing we're going to the bay next week and will fish some. So I think I've got a little fishing buddy in the making. This could naturally lead to me buying an old boat for the ponds/lakes around here. Score one for Dad.

She also went to an overnight camp last week where they shot BB guns among other things. I happen to have an old Red Ryder that was my grandfather's. Also at Wal-Mart last, she sees a container of BBs and gets all excited. I ask her if she wants to shoot it, and of course she does. My next question was does she want to shoot a real gun, or just the BB gun. We can set up targets in our backyard for the BBs, no big deal.

That got me thinking, what is a good age to start out on? I have an old Ruger MKII, and a cheap .22 revolver. Those would definitely be the starting point, and I don't think I would even bother trying to take my others and do any shooting of my own. It would strictly be to teach her safety and let her shoot for maybe 30-45 minutes. I don't want to wear her out.

Any suggestions? Experiences? Things to avoid.