If you can't bring the wife, then try to bring a friendly friend to help out, for set up, tear down, security, and chit-chat when it gets slow. Agree with the other recommendation to be friendly and attentive, but not the overbearing helicopter parent. I've had dealers playing Candy Crush on their phones and seem annoyed when I walk up like I am interrupting them, and I've had dealers who want to talk non-stop while I am trying to look through their sales books and I can't focus on two things at once. Know your audience, you may need to adjust your communications style for different customers.
Also have a clear plan about discounts and try to apply it consistently. Some customers will expect a discount off the listed prices, especially if multiple items are purchased at the same time. Obviously the amount of discount depends on how well the items are priced to begin with. Hopefully they are priced fairly so that you don't have to regularly give a 30%-40% discount in order for it to be attractive to a customer. Personally I try to avoid dealers on
ebay or at shows that list items at high retail prices and then offer big sales or expect you to Make Offer on everything. If you can manage a 10-20% discount for purchases over a certain amount, it is a good way to retain future customers.
More importantly (in my opinion) is to make sure you have your listed prices on everything. I have sometimes gone through dealer's stocks that just have the CV listed and I have to negotiate the price on every item. Takes a lot of time and I have passed up on items I wanted but didn't want to wait around.
Also if you do bring your
ebay stock, do make sure to check your
ebay sales throughout the day and pull down any items that are sold. I once tried to buy a stamp out of a dealer's sales book and he did a double-take on it, he showed me the email from
ebay that morning showing someone else had already bought it, and he hadn't taken it out of the book yet. Disappointing.
Note this is all from a buyer's perspective. I've never had a table at a show myself. Can't tell you what will sell well or not, and I have frequently heard dealers say they can't predict it either. Areas that they may carry with them to 5 shows with no interest will suddenly have multiple people wanting that same area. Best to bring as much priced material as you can, in case you get that collector looking for Match & Medicine stamps or Junior Ducks, you don't want to have to say "I didn't bring that box with me."
Have fun and hope it is successful.