The best known and most frequent forms are the asari (Tapes philippinarum), the hamaguri (Meretrix lusoria), the baka (Mactra sulcataria), the aka-gai (Scapharca inflata), the kaki (oyster), the awabi (Haliotis japonica), the sazae (Turbo cornutus), the hora-gai (Trilonium tritonius), &c. Among the cephalopods several are of great value as articles of food, e.g.
Look at other blogs where other MLM-interested folks gather, such as Kathy Baka's blog, and start up conversations there.
Try classics like pinakbet, made with vegetables and chicken as well as authentic pancit and baka.