My craft sale experience is limited, but here are my comments:
If you really want to make some money you'll have to have a unique idea. For example, knit ponchos and Capri-Sun purses are "big" right now, but everyone else has those ideas. No matter how nice yours are, they're still going to be similar to the ones at ten other booths! You'll need to be on the cutting edge to make money. You need to sell the new item that no one else thought of yet.
You'll have to find a low-cost source for your materials. If you're buying your stuff for full price at the craft store, you'll have to price it sky-high to make a profit. Along these same lines, don't go into debt buying your materials. I saw a number of people at our craft sale who sold next to nothing. Don't over-do the first time; see how it goes before you jump in too deep.
Try to have a couple dollar items -- often people will buy something for a dollar, but they'll stop and examine the $10 items carefully so they can make them at home. At my daughter's sale, her biggest profit items were homemade spice mixes and bread mixes. She also sold a ton of bubble magnets at .25 each.
Choose your crafts carefully -- if they don't sell, you're stuck with them. Try to make items that you'd be willing to give as Christmas gifts, or items that you could sell on ebay (if things don't go well at the craft sale).
Find out how much space you'll have at the craft sale. The big one near us gives 10 square feet per person (for $45). They encourage people to bring shelves, wire grids, etc. so they can "go up instead of out". Anyway, find out how much space you'll have and plan your display ahead of time.
. Glad it will work for you.
