Read this: http://artsandcrafts.about.com/od/accountingandpricing/a/priceyourcrafts.htm
And This : http://yourcraftbusiness.com/Your-Craft-Business/pricing-handcrafted-work.html
And then google this " how to charge for your craft work"
You must approach the issue of "what to charge" just like any other company.
The short answer id "KNOW THE MARKET"
Find folks that do custom work like yourself. Both better, and worse quality. Find companies making the same product commercially. This is a REALLY boiled down snapshot of where to begin. If you were making space shuttles, you'd pretty much have a captive market. So, you'd get a lot more for your space shuttles without competition. That is, provided somebody was in the market for a space shuttle in the first place. See what I mean?
WHERE you sell your goods is pretty important too. Is it reasonable to expect a person at a flea market to pay $5000 for a dress, or would that person most likely go to a fancy smancy store for something of that asking price? How is your product different, better, more affordable than what already exists? Why is your asking price more than that guy's asking price? You better have an answer ready for the customer that asks you that, and not a fumble stumble one either. In sales we called that the "$2 dollar story", meaning we had a reasonable answer as to why our widget was worth $2 more than the next guy's widget. Features and benefits. You're one-up on the competition, even if you have the identical widget, if you can explain the features and benefits better than he can. Ever heard of "Know thy self"? We called that "Know they shelf".
Everything above is to be taken with the "pill" of understanding that I assume you intend to make a profit from your handiwork. Folks that sell their stuff "just to make a little to support their hobby" KILL the market. You should hear my teeth gritting right now.
You can get TONS of free and low cost information from retired professionals in all facets of the business world here: SCORE http://www.score.org/
Time to pull the turkey out of the deep frier....
Bumbadeeda Bumbadeeda.....Happy sales, to you...
Jake