Until now, as a writer, all you've focused on is the Craft of writing.
However, your writing is not the same thing as your business.
This book gives you a combination of career and writer/life advice to help you take that next step, and go from being merely a writer to being a professional, from someone who has had to learn all this the hard way.
Some of the topics discussed include:
DBAs
Intellectual property
Money
Communication
Self-confidence 101
The physicality of writing
What's stopping you from writing
The Business for Breakfast series contains bite-sized business advice. This is a 101 level book, with beginning advice for the professional.
Be sure to read all the books in this series!