About all I would say is look for a main herd trail and then if you can find a single trail that has large tracks on it , See if you can find trails leading to the beeding areas .If you put the D-40 out rember that if the trail is more that 30 feet away from the camera all you will get is good daytime pictures . If there is no winter feed ing the area the deer will be in there winter yard area or where there is a good food source .
Charlie