Say hello greet people as they walk by. Don't overwhelm, just acknowledge. Offer a tag line with general information. For example, I usually say, "Hi, all of our products are hand made in Montana from our own alpacas." Do not get discouraged if they do not make eye contact or just smile and walk away. Remember how many people are vying for their attention.
Pay attention- Do not read a book or be on the phone. This is an opportunity to meet viable clients / customers. Be available to them. If you look bored, they will move on quickly or not even bother to stop.