Do you have an eBook or a physical book? Does the book have an ISBN #?

If you have an ISBN, then Amazon & Google Books are certainly appropriate places to get listed.

If you don’t, then you’ll be self-promoting your self-published book. As a minimum, provide a website for the [e]Book (or a page in your existing website’s store). Provide samples of the book’s contents, as well as price, size, number of pages, etc. You need to build trust in the prospective buyer.

Don’t forget free classified services, such as Craigslist, etc.

If the book is more than a how-to (i.e., it’s a personal story, etc.), then create a press release for it, and distribute it (there are lots of services, such as www.free-press-release.com).

If there are self-contained excerpts, publish them at various article banks online.

To get people interested in your book, post information where your target audience visits online. Likewise, try to get people to link to your book. If you have a blog, announce it.