Once your book is available for sale on Amazon, you can assist in the promotion of your book by creating an Amazon Author Page.
At Amazon Author Central you'll need to click on the ‘Join Now’ icon and enter some basic information so Amazon can verify that you are the author before you can set up your page. Then you can add your bibliography, an engaging biography, high quality, interesting photos, links to your Twitter account and blog, videos, a calendar of events with all of your author venues given, and you can even set up a discussion board.
Make sure your Author Central page looks professional and reflects your writing style or brand. A sloppy page will lead readers to think your book is sloppy, too. Not every author thinks it is essential to have an Amazon Author Page, but Author Central is free space that Amazon provides authors who sell on their platform so why not take advantage of it?