Well known turkey expert Dave Constantine told me that he and other hunters have found that for the most part all wild turkeys tend to fly down from the roost away from the rising sun. They are not sure why this is true, but they think it is so they can better see predators when they fly down. Keep this in mind when setting up, make sure you use this to your advantage. Usually a good distance to set up from the turkey is about 100 yards. If you go any closer you must be very quiet.
Turkeys normally fly near or into a field.
Setting up on the edge of the field is where you want to be most of the time for your first setup. So, putting your decoys in the field should work well. Gobblers normally fly where there is sun, so they can show off their bright feathers to the hens. So keep this is mind too when picking your set up spot. If you are trying to decide between two places to set up, go where there is more sun.