S.H.
I've done 3 craft shows. Make your display as simple as possible. Personally, I like to see like items together. I sell children's character soaps (Dora, Superman, etc.); so, I like to put them all together by character. I use the "grids" that you can put together with those joints, which makes it easy to travel with, but they are a pain to put together at the show. I am trying to find another solution. lol But I got one of the folding tables that folds in half and snaps together on the inside with a handle; so, you can carry it along. I also bought a dolly that breaks down flat, which makes carrying stuff to and from the car MUCH easier.
You can take a chair, but try to use it sparingly, as people are more likely to stop by if you are standing and look ready to help them. For my table covers, by the way, I use a black sheet I got at Wal-Mart for about $3. Just put the "top" (that goes toward the head of the bed) in the back of the table.
As far as pricing, you can either sell them at a special "show price" or you can include the tax in the price. (I keep mine at whole dollar (or dollar and a half) prices to make it easier.) You can either make tags for each item or a sign in the clear frames that state the price.
You'll need to take some cash to make change with. So, get either a cash box or something you can keep an eye on. I used an apron to carry my cash at my yard sale, and I'm thinking of doing this at the shows, too. I have someone else who goes with me; so, I have someone to keep an eye on my cash box. But if you are going alone, be sure to keep it someplace safe.
You'll also need bags if you have small items, or something that people can carry the items in. I have small items, so I use white lunch bags that I place a business label on.
Take business cards. If you can, hand out samples. Since I make soaps myself, I hand out small samples of soaps with my business card, and it is amazing how many more people will stop because you've given them something to look at. Your samples don't have to be your actual item, but something, even if it's just a piece of candy. lol
Make friends with your show neighbors, because when you have to use the restroom, they can help keep an eye on things for you. And you may be able to return the favor for them, too. (Take your cash box, though.) You may also want to have a sign that states you'll be right back. Grab some of their cards, too, and ask if they are interested in keeping in touch so you can share craft show dates and registration information.
Don't forget to make a nice sign with your business name (and site, if you have one.)
By the way, what do you sell? I may be able to help you with more ideas, knowing what you're selling. I've seen some really neat crafts at these shows, and it's great to see so much talent out there.
Best wishes to you!