Going off what everyone else said....be sure to complete the arrival and departure part of the form including signing and dating with the appropriate arrival and departure dates.

Make sure you potty before the plane lands and as soon as you make it out of the plane door, start power walking.

We've never really had much of a wait for Customs but we usually walk to the far side of the room to get into line. People tend to just get in the first line they see.

Your luggage may be set off to the side of the luggage carousel if you had a wait in the immigration hall.