Figure on the knives taking you WAAAAY longer than you normally would. Something's bound to go wrong.
Don't got for numbers, go for quality and variety. I think quality is number one though. I think you can definitely have too many knives. There are always makers at a show that have a table just covered in knives. I think this does two negatives... for one, it makes it look like you can't sell anything you make and they just pile up... two, it overwhelms the customer.
Of course the guys who do that would disagree with me
Make sure you have your business cards, and a sign of some sort to mark your table.
GOTTA have something to wipe down your knives.... especially since you're using carbon steel. Wipe them down about ten times more than you think you need to. Somebody will spit while they're talking, and if you're not wiping them down constantly, you'll have spots that have to be sanded out before the show is over.
Have sheaths done and zippered pouches for each knife. I've lost several sales over the years by NOT having that part covered.
Keep in mind that you'll meet some completely awesome people, and some that you want to throw across the room... take it all in stride and enjoy the experience.
Dress well. I wear a suit to a show whether the show promoter asks us to or not. If I'm trying to sell a $1500 bowie, I feel it necessary to look the part. A suit isn't necessary (that's just how I roll

) but a dirty Tshirt and jeans that you just wore the other day to grind in is a bad choice! (I know you wouldn't do that Rusty, just throwing it out there for anybody that would).
Take a small cooler with pop and snacks if you can.... it will save you $50 or more over the week-end!
That's all I've got for now
Best of luck and have fun Rusty!!! 2thumbs