A book sell sheet (also called a one-sheet) is a handy compilation of the physical aspects of your book, what it’s about, and where a retailer can order it. It’s normally used as a sales aid at trade shows and also for sending to a bookseller who is interested in stocking your book. A sell sheet can also be included in a media kit on your website as it gives a comprehensive overview of your book.
Video tip: Don't Ask Friends to Choose Your Book's Cover
It may be tempting to post several book cover sketches from your designer and ask friends on Facebook to select their favorite. Don’t do it! You need unbiased opinions and your friends don't want to tell you your "baby" is ugly.