This book covers all you need to know to establish a visual art career with successful sales. You'll learn about: Pricing, marketing, how to approach curators, getting represented by a gallery, publicity & promotion, health & safety, copyright & appropriation, and taxation.
This is mostly useful for commercial artists producing 2D work, but still nice to have advice on all the aspects of running a business for would-be self-employed artists. A good place to start.