Weather you know if there are turkeys in the area or not go to the areaat dusk or dark and call using an owl call, coyote call etc. You can call at your vehicle then at a high point. Using these calls you can pinpoint where the turkeys are roosting because the Gobblers will respond to your locater calls by gobbling, this is called Roosting turkeys. Don't disturb them.

Turkeys sleep in a tree (Roost) usually on a ridge, hill, or by a creek or river, they will not be far from water. After you have there roost pinpointed you can go in the next morning beingcareful not to be seen and pattern them. Patterning them is finding out where they go after fly down if you can find the roost and the strut zone you will have most the work done.
Good luck and be safe!