美国机场的标志很清楚, just follow signs,一切都很容易,看清楚你的登记门,坐对机场的bus, 大体的步骤是:
When you arrive at Detroit around noon and go out of the gate, you will enter custom at first. After t hat, go downstairs to claim your luggage(large ones). Use cart to take your luggage to where to exam them and have them exam again and then put them on belt. No further form or sheet for that. Then take bus to corresponding building and walk to find corresponding gate you will take another plane to destination. You'd have that building and gate number on your ticket. If you are not sure if the numbers correct, try to find the gate number by searching flight number in departure column on screen. Be careful to take the right bus and get off at the right building. In order to do these stuff as quickly as possible, be sure try to get off the plane at Detroit as early as possible. Sometime must be spent waiting for luggage's. If anything is unclear, ask the people working in the airport. Sounds a little bit complicated for the one who goes abroad for the first time. But don't worry. I am sure you can manage to do that. btw, bring some dollar bill or quarters, the cart is not free.