Maybe he has a craps table at home and practices, or maybe he is a psychic, who knows. But when he bets, you should bet the same way he does. Buy in with a large amount and make a big first bet. Also play at a casino that gives you credit for your spread instead of your individual bets. A shooter can hold the dice for an hour, and everyone at the table cleans up.
Craps is a people-oriented game.
You can talk to the gamblers next to you, and the dealers as well. Ask them how the table is going. Talk to everyone. Ask if they're good shooters. Craps is a wonderful, exciting, profitable game for any casino-goer.