I have done 2 commission quilts. I decided a price based on the design, amount of work, etc. I would like to sell more of my quilts on Etsy. I have figured out a formula that will work for me. I calculate a cost per sq. inch and that way all my machine quilted items will be fairly priced. Handquilted items would be definitely more.
I followed the craft fairs for a number of years and my work is known locally. Word of mouth, business cards and my blog will probably be my most influential advertising.
Hope this is helpful.