Over at January's blog, Deb recommended this site, which has lots of ideas for how to promote a book. I suspect that many of us who have been following publishing can be surprised at how much we'll need to do to support our books. Still, it's always good to have some fresh ideas.
I'd also recommend this page of the 52 Projects website. Lots of great ideas here.
A book I return to again and again is 101 Ways to Make Poems Sell: The Salt Guide to Getting and Staying Published by Chris Hamilton-Emery. Go here to read the first chapter. If you've been submitting to journals for any length of time, the 50 Dos and Don'ts at the end of the chapter will probably seem self-evident to you. But the rest of the book is full of good ideas to help you build your profile and sell your book.