Convert an e-book into a child-friendly e-book

It is vital that you are a native English speaker for this project.
I have written an e-book on child anger. for children aged 4 to 10 to go in conjunction with a course I'm running to help parents to manage their child's anger.
It is just under 3900 words.
I would like it to be more child-friendly with the kind of feel of the worksheets on this site. Including a cover page. https://www.mylemarks.com/store/c6/anger-worksheets.html
It will just need to be a downloadable PDF, but I realise the pictures may need to be black and white to make it printer friendly. I have a subscription to Freepik, so can use any images from there in the PDF.