People are much more likely to buy your book if they feel a connection with you and see you as an expert willing to share your knowledge. A blog is a perfect way to establish such a connection.
Marketing & publishing resource
Whether you go with a commercial publisher or self-publish, you must commit yourself to marketing your book to make it a success.
Getting your book into the commercial pipeline requires understanding the machinery of the book trade.
If you do not feel comfortable taking on the tasks of managing production of your book -- for example, hiring and supervising an editor, designer, indexer, printer, etc. -- consider using a book packager or consultant.
A quality website is your professional face to the world, and fortunately it takes relatively little money and effort to put on a good face.
Given the considerable frustrations of working with commercial publishers, you may well consider self-publishing your book.
While POD is the best way to produce small quantities of a book, offset printing yields by far the greatest economy of scale and can produce a more professional-looking product.
The savvy use of print-on-demand technology can lead to successful self-publishing.
Displaying your book on Google Book Search is an excellent way to enable potential customers to browse your book online and buy it.