Well, first I would suggest to check out my introduction post on CoderDojo to give you an idea of these free clubs. If that might be something you are interested in you can search for one in your area on coderdojo.com. If you can't find any there are many more initiatives likes CodeClub, RailsGirls, etc.

If that doesn't seem like something you need or you can't find something nearby, I would suggest to get started with Scratch. This is a very low level program which children can use to easily put together games and animations. Instead of needing to write code, they can simply put code together like a puzzle.

You can find many resources on this in the open source library of CoderDojo: Kata

Good Luck!