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.
Marketing & publishing resource
The savvy use of print-on-demand technology can lead to successful self-publishing.
The design of your book's cover and text is critical to its perception by readers as a quality book. Such design, if done correctly, will require a significant investment, but it is a one-time cost that will pay off handsomely in terms of sales and your reputation as an author/publisher.
Given the considerable frustrations of working with commercial publishers, you may well consider self-publishing your book.
Displaying your book on Google Book Search is an excellent way to enable potential customers to browse your book online and buy it.
Although you can do considerable publicity and marketing yourself, a commercial firm can bring useful expertise to promoting your book.
There are many cautions about using a subsidy publisher, but if carefully managed, they can be useful under some circumstances.
Getting your book into the commercial pipeline requires understanding the machinery of the book trade.
There are many active organizations and discussion groups and useful newsletters to help you with your writing, marketing and publishing. Here's a list: