I started doing craft shows last year. One suggestion I would make is to only go to the well established craft shows.One show I attended was a long time established show that I did very well at. The other one was a new craft show that hadn't been advertised very well and I did make enough to cover my entry fee. I sell checkbook covers, casserole covers, potholders, table runners and knitted cowls. My table runners sell the least and I know I have them competitively priced.
It is a long day but my DD also has a booth of her jewelry so we consider it Mother/Daughter time. Good luck