Find the crook or crown of the board and remove it on the table saw by cutting off a blades width. If you have a crown on both sides of your slab see the teacher. Mark an X on the freshly cut edge.
Set your slab up in the sleigh with your X you marked facing the fence. Remove a blades width on one end. Mark an X on the freshly cut edge.
Cut your slab to width. Check your documents for the width. Be sure to place the X to the fence.
Cut your slab to length. Check your documents for the length. Be sure to place the X to the fence and your other X to the mitre gauge.