I'd Rather Be in the Studio - The Artist's No-Excuse Guide to Self-Promotion by Alyson B. Stanfield
This is a practical book that could send your art career to new heights. Having a business card is only the start. Alyson Stanfield has many excellent steps for you to take, starting with Your Definition of Success. She guides you through goal setting and making a plan of action, and along the way demolishes those nagging excuses such as I'm an introvert. Alyson explains why it is important to use the internet to reach your customers and provides on-line forms and examples to get you started. Once you've read the book, you will want your own reference copy to turn time and again to the 16 steps to action.

