Thought I'd add this link from Caryl Bryer Fallert-Gentry's page. Of course, she's amazing & charges $600-800/square foot for her commissioned quilts (meaning a crib-sized quilt would be $11K), but the principles are still the same:
http://www.bryerpatch.com/faq/marketing.htm
PS -- RosieQ, good luck with your business! We need more people with professional quilting businesses!
It does take a bit of work to educate potential buyers, but I find a lot of clients actually really like learning about quilting processes and techniques. After that, try to start looking & listening for what terms in your part of the country people use to communicate the concept of quality & use those words. I've also found that people in my area tend to value the same quilt at a higher price just by me changing from referring to myself as a "quilter" to referring to myself as a "artist with a quilting business". The more we can frame our work as a business, the better clients are able to understand why we don't work for $1/hour.