Spend time looking at other booths so you get a feel for booths that attract buyers.

Your booth should be well stocked with merchandise, but not over-stocked, as this may look junky.  Keep backup stock handy, perhaps in plastic tubs that stack and double as a display unit with a cloth on top. Area under tables, or at the back of the booth may hold excess inventory. 

Move items around as you sell, so your display always looks fresh.  Move items close together so they are in a grouping.

Your booth is your shop and should be decorated with props, curtains, lattice panels, Christmas trees or greens, garlands.

Most merchandise should be at eye level but have some display units above and below that level.

If your display is on a table, and there is storage underneath, the table should be completely skirted.  Buy plastic skirting, or sew fabric panels.  The skirting can be fastened to the table top with masking tape and a table covering placed on top.

If you have a back wall, put up a backdrop of shelves, a hanging display, or a folding screen on which to display merchandise.

Display a variety of items, and avoid duplicates.

Lighting is essential, even if the area is well lit.  Spotlights give emphasis to the merchandise.

If you are selling outdoors, a canopy is essential in case it rains, or if the weather is hot.

Keep your background booth color neutral so your merchandise displays well.  Fabrics with bright colors may detract from the merchandise.  White shows dirt easily and an off-white may be less stark.

A piece of carpeting will give you some relief for your feet as you will be standing most of the day. 

All items should be priced with easy to read price tags.  Shoppers may walk away before they will ask the price of an item.  For large tags use the computer and print them on cardstock.  Punch a hole in them and fasten to the merchandise with ribbon or a small safety pin.  Other price tags can be printed on the computer using adhesive paper and cut into strips with a paper cutter.

Cover your display at night.  If there is security at night then old sheets may be sufficient. Remove valuable items from the display.

If you can select your location, select a spot near a landmark so people can find you easier.  Don't select a spot near a stage as there may be congestion while entertainment is in progress.  Don't select a spot near the main doors as people like to browse a bit before they make a purchase.  Also don't select a spot outside the washrooms or food areas as people are often in a hurry in these areas.

Post a sign in your booth with your business name. Give out business cards.  If you are attending other craft shows provide a handout of upcoming shows so your customers will know which events you will be selling at.

Be careful with money.  You may wish to sew an inside pocket into a shirt with a Velcro closure so you have a safe place to carry bills.

Most of all, have fun.