Interview Questions:
Graphic Design Interview Questions (Article with questions and example answers)
Freelance:
Transitioning From Graphic Designer to Business Owner (Design Cuts)
How to Pave Your Own Path As a Freelancer (Graphic Arts Today Magazine)
How Much Should I Charge for Graphic Design Work? (Creative Market)
How Much Do Graphic Designers Make? (Rasmussen College Article)
Developing your Business:
The Art of the Pitch (Pitching yourself / business)
Amy Portfiled: List Building Master Class (Free)
Transitioning from Graphic Designer to Business Owner
With Matt Slightam (Video 56min)
classes.design.ucla.edu/Fall06/161A/projects/winy/project%2001/type2.html