Jessica, it's hard to predict what items will do well, especially at a first show. A lot depends on the market, demographics & time of year of the show. We've done shows in locations where some varieties of our soaps sell out. Then we do another show in another town & those soaps might not sell as well.
IMHO, the best advice I could give you would be to try to take as many different varieties as possible & let the market tell you what's popular in that specific market. Take some plain mugs, some people like those. Take some mugs that are geared towards being gifts, since it will be close to Christmas. Basically, figure out the different "categories" of products you want to make & try to have some products from each category.
That way, after the show, you'll be able to see which category of products sold best & can start making more of those for the next show. But again, some categories/products might sell really well at this show but might not move as well at another show (location, demographics, time of year, etc...).
Keep track of your inventory & sales for each show you do. Then, over time, you'll be able to spot trends of which items seem to sell better at which shows/locations. That will help you predict what products will sell better the next time you attend that show.
Good Luck with your first show!
