I accept cc's at craft shows, but I'm also a legitimate business, collecting sales tax, etc...and I have had lots of bounced checks over the years...
It is a costly price of business...you can check out some of the info regarding fees thru Sam's Club or Costco.
If you are just starting out, why not stay with Check and cash for awhile...When I get to a location, I always will look for the cash station, so I can direct the customer.