A tickle stick is just a thin stick. Nothing more, nothing less. You use it to tickle the lobster out of its hole. It can be just a thin metal rod with a loop on one end for a lanyard or something (it's way to easy to lose one, so it's not a matter of if, but rather when it'll happen to you). Some sell the fiberglass ones, but I don't like 'em. And remember, you can't kill the lobster! You gotta cook it 1st! Once the lobster comes out of its hole and you successfully grabbed it by its carapace (far enough to the back of it so that it can't pinch you) you gotta measure it, to make sure it's legal. You'll get a brochure, I believe, that explains the details of measuring when you buy your Massachusetts recreational lobster license. Incidentally, it's illegal for divers to catch lobster in Maine. Once you measured the lobster and found out that it's of legal size, you put it into a simple game bag, usually made of mesh, with a closable opening (can't have the critters escaping on you now, can we?). No need to worry about getting out of the water quickly, since lobsters have to remain alive for cooking. Also, make sure you have a cooler with some seawater on shore to put the lobsters in on a hot summer day.
-Roman.