A sim is the easiest. However you asked several very good questions. The little feller needs to listen and know how to behave around other people's models. That is possibly the most important thing. The other is exposure, let them have acess to all the safe tools, crashed models, and paint they can handle. My son is leaning more tward rockets these days which is just fine, the idea for me is to spend time with him. For what its worth, my son was flying on a sim a little after his first birthday, at 18 mo he flew his first model. Don't get me wrong he is no Chip or Jason by any means. It is just something we do togeather