I have done craft shows in Texas and I can add the following tips:
1. Find a craft that packs up and transports easily. This will make set up and tear down much quicker.
2. Find out how the show will deal with weather conditions if it is held outside. I once paid $75 for a booth, the show was rained out and so was the rain date. There were no refunds.
3. Crafters are now being asked to compete with sellers offering imported items that the sellers only had to put a price on. I have been asked to lower the price of my hand made items to match the imported items prices. I refused to do it.
4. Your price calculation should include those items already mentioned in this forum, and should also include the cost of the booth. High booth fees will definatley cut into your profits, but typically will put you amonst a higher class of crafters/artists.
5. Trial and error will be your best teacher in the long run.