We do a number of shows each year, a couple of things that might shorten the learning curve. start a box of items that you will likely need at shows, here many require a fire extingusher, then I would add some tape the reciept book, a little wire, as time goes on you will develope your own box. the most important thing is being at the right show, since there were booths that did not make sales at this show I would plan on doing a different show that weekend next year. Prescout shows that you are interested in to see if they have a large flow of traffic or a flow of the special type customer you are looking for, remember your time is your most precious asset, try to use it wisely.
Congratulations on making a sale at what I think may have been a poor show, ("to little foot traffic") good job.