Nicolette,
Best of luck. I do remember my first show and the feeling you are describing.
Hope you have a fabulous day, you are probably at the show now. If you are like me, you arrived super organized, over- prepared, set everything up super fast and have everything you need. When you come back, tell us where the show was, what other vendors were there, how the attendance was.
Don't forget, sometimes it's not how much money you make, it's the contacts and potential customers you make and getting more exposure for your work. My personal experience with shows was not profitable, as far as making a lot of sales. I considered it a good day if by the end, I only had a few business cards or brochures left.