I had to Google that! (I'm middle aged with no kids, and I don't think we have them up here anyway!)
What's in the manual would depend on whether it's intended as a version of the manufacturers manual or as a separate, independent publication. The manufacturer doesn't really cater for the used buyer so focuses on driving tips and where controls are, and they certainly won't include common faults! If you can give us a bit more detail we might be able to help better.
PS, I'd love to see the result!