Launch your site as soon as you can. It's impossible to be too early, and it's never too late. By all means, don't wait until your book's publication date. Having a Web site is not only a valuable tool for publicizing a book, but for writing a book, too. More on that later.
"The best time to start promoting your book is three years before it comes out," says bestselling author Seth Godin. "Three years to build a reputation, build a permission asset, build a blog, build a following, build credibility, and build the connections you'll need later."