Commonominator

So, I’ve had this idea for a while and I thought I would attempt to see it through. I want to create a 2D interactive children’s book that could be used on a tablet. I really want to emphasize being able to build my own characters…. My only problem is I have no idea where to start; the internet is amazing, but there is almost too much info to attempt to sort through. What software (preferably free), books, or skills would you guys recommend? I’m not trying to build a complex virtual world just sort of simple fixed cartoonish characters and backgrounds.

Any help will be greatly appreciated.

Please just break it down as if I am a small child..

Thanks