Sometimes just mentioning that an item reminds you of your grandmother's house during the 60's will be enough to get them going. And remember that you won't get antique prices here. People are looking for bargains, not museum pieces. You can place collectibles towards the back of your 'store'. For collectors half the fun is in the search.
Men are a totally different type of yard sale shopper.
Even when they're just browsing, they'll shop with a goal in mind. And they want to shop quickly. If you'll be offering tools or building supplies put them up front where they'll be easily seen. And have an extension cord available if anything is electric powered. Items must be marked.