I just had my first craft sale--so I think I should have asked the browsers. But... what I felt comfortable with was greeting each passerby who glanced my way, with a bright smile and a "Hello." That was it. If they happened to stop I might point out what types of things were there--such as "There are table toppers, pillowcases, bookmarks, doll blankets, and table runners as I [ointed quicly to each pile." Then I'd leave it at that. My full table seemed a bit confusing, so I thought that would help them decide if there was something they were looking for. Also, if someone was really looking at table runners, I invite them to move them all around and dig under because they were all different.
I couldn't fit all the photos on the table, so if someone showed a lot of interest in them, I'd pull the rest out from under the table so they had more choices. They really appreciated that.
The ladies on either side of me were awesome. I bought soap from one, and jam from another. The jam was 3/$10 and she said to take another for a fellow vendor, but I couldn't do it. I assured her it'd take us a while to get through 3, but that was so sweet of her.
Prices on my stuff were easy to see--I had price lists as well as prices on baskets of smaller stuff and each individual bigger item.