Read these:
_The E-Myth Revisisted: Why Most Small Businesses Don't Work and What to Do About It_ - a discussion of why most small businesses started by practitioners in a field don't grow and eventually fail. Focuses on the failures of entrepreneurs and what you can do to make your business a success (rather than just another employer that you happen to own).
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http://www.amazon.com/exec/obidos/ASIN/088...theofficiafaisal>
_Selling the Invisible: A Field Guide to Modern Marketing_ - probably the most accessible and useful book I've seen on the general concepts of modern marketing. Talks theory, not specifics.
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http://www.amazon.com/exec/obidos/ASIN/044...theofficiafaisal>