Clive Cussler has 37 books with less than 150 million in sales.
Well, what I did would have been to read the appropriate bit within the 'Writer's Handbook'. Even kids can be wonderful test readers for the initial novel! Is there anything else you'd like to share around? https://getsocialselling.com/story3314133/10-tips-to-promote-reading-to-be-a-hobby-for-your-child