I did craft fairs 20 years ago and concluded that all crafters should leave their craft home and bring a soda machine and bags of potato chips - you will be sure to sell out :)
I'd recommend you have a few high quality expensive items to draw attention to your crafts, then medium and low price items that people will more likely buy. Don't work yourself into a frazzle making lots of items as predicting what might sell is a turkey shoot. Enjoy making your items and don't crank them out just for the show.