Edit Children's Story with Some Ghost Writing

I have written my first children's chapter book. I need help making sure the page structure is right, the story flows and that it is written grammatically correct. I need someone to edit the book and to do small ghost writing. The ghostwriting part is if you have to add or takeaway from the story to make it sound good and flow well for the young reader. My goal was to make it easy for ages 7-9.

The book according to word doc is 5.5x8.5, 7,302 words, and 102 pages at 18pt serif font.