I want to get my son off his Playstaion and doing something more meaningful.
Wow, a responsible parent. I didn't think they existed any more.
Hard to say since you didn't mention their age. The MagPi magazine is a good resource to start with:
Maybe after they gain some experience, a breadboard and some LED's; there are some kits available that have everything you need. That would expose them to programming, but it would make it more fun because they would be controlling physical things that they can see change.