Arriving at a sprawling flea market on a crisp Saturday morning can be exciting. So many potential treasures might be hidden among the dusty piles of cast-off, second-hand goods. Yet often it’s overwhelming, even for experts. With acres of furniture, art, accessories and more stretching out in front of you, where do you begin? With a list, suggests New York interior designer Jenny Dina Kirschner, who rarely goes hunting for vintage items without one. On a recent flea market visit, “we made a list of things we still needed.