Promoting your book to the world when it releases is super important to getting it started. One of the ways to do this is to release a press release to the different news services. These can be paid or free. You can also use this usually one page document in all your other media. A press release tells the who, what, where, why and how about your book.
Lulu.com on of the major print on demand book site has a two part article on their blog, Lulu.com/blog, on how to write the release. Pretty simple and right to the point.
Part 1 has to do with the overall idea of how a press release works.
PR Part 1: Ready, Set, Press Release!
Part 2 covers the details of the different parts and how to pull them together.
PR Part 2: Write the Best Press Release - EVER!
Along with releasing a press release for your book you should also have similar info on yourself. Every author needs an Author Press Kit. A page on your website that is about you. What you do, who you are, your books, your picture. I often recommend having several different length bios for different uses. Your About page is often one of the most read pages on your site. Think of it as a mini home page.
Lulu.com also put out a great article on how to do this and what you should include
Author Press Kit: How You Market You
I also cover this info in my on-line course, How to Market Your Book
Ok time to get your book marketing going.