Don't sell yourself short! Here is a free, well-written article, on DESCRIPTIONS for your book. from:
Self Published Author by Bowker, email is SPA@bowker.com
By Penny C. Sansevieri
Regardless of the site you’re using to sell your books, book descriptions are more important to sales than most authors realize. Many times I’ll see blocks of text pulled from the back of the book and while, in theory, that’s not a bad idea, you’ll want to make sure that your book description is powerful, and keep an eye on formatting – things like spacing, bulleting, and bolding. "