create 10 E-Book covers from one 10 chapter book

I have a 100-page children's Ebook & paperback book on Amazon and want to make 10 small ebooks to make a series ( 10 x one chapter each). I would like a best-selling cover front & back design theme for all 10 chapters at a sensible price, please.
I have uploaded the existing amazon cover for the large book for interest..