Scout, scout, then scout some more. Learn where the birds like to roost and move. As season approaches double check all yor areas. As green up occurs the birds can move. I like to have several (read as many as possible) roost sites scouted before season. If I drive to one and another vehicle is parked there I have more to go to. Keep scouting during sesason as hunting pressure can cause the birds to change routine.

Practice a couple of diffferent types of calls so you can get some decent sounds.