Having done craft shows in the past - with sweaters and other knitted items, I know how tough and price sensitive the crowds can be. One thing I found useful and am doing myself again this year before jumping back into the scene, is visiting the local shows as a customer and get a feel for the types of things that are being sold, the kinds of prices other vendors are charging and looking at what others are selling and making sure that I would stand out from the crowd.
I had some pretty unique and interested products that would appeal to a small market and after my first show, added in some more "middle of the road" items, that took less time to make and were easy money makers. Taking samples or sample book of some of your higher end items is a great idea. It allows people to see what you have and make orders, without you having to put in tremendous amounts of time beforehand on items that might not sell.
I hope this helps!