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It is worth waiting until you have a few reviews (a minimum of five) before telling the world about it. (If you are planning to do a KDP launch, you must wait 30 days before you can offer it.) You can download your Kindle book in .mobi format from the KDP desktop, and email that to prospective reviewers. There are many review websites to which you can submit your book. Consider popular review sites dedicated to helping you get book reviews such as Kirkus Reviews, Kindle Book Review.Net, and Goodreads. It is acceptable for a small percentage of your reviews to be written by people you know. However, you should encourage friends and family to mention their connection at the bottom of their reviews. You should upload a new version if necessary. If not, you can add one.

Summary:
Avoid the temptation to officially launch your book the second that it's available on Amazon. Use forums to offer free copies of your book in exchange for honest reviews. Submit your eBook to select review sites. Get friends and acquaintances to write a few reviews. Correct any errors brought up during the pre-launch phase. Ensure that there is a page for your book on Goodreads.