Ok, so this year is going to be my first time turkey hunting. I have practiced a lot with my calling, and have managed to get a few gobblers within range practicing. Anyway, I have never scouted for turkeys before and am going this weekend to see what I can find. Below is a pic of the main area I will be hunting... I have color coded it and will explain what each means.

The orange line is the boundary of where I can hunt. The blue lines represent water. The purple area is CRP grass, and the yellow field will be planted corn this spring. Last year it was beans. The red dot is where I put the smackdown on my buck last fall. The big river to the North looks great, but I do not have permission to hunt that.
Anyways, how would one go about looking for turkey/ turkey sign before the season? Do I bring a call and see if I can get some to talk? Or do I just sit up on a ridge and look for birds? I will be getting there before daylight ready to scout, but could use some advice as to what you guys would do. Do any areas on that photo look better than others? There are other spots I can hunt besides the above photo, but they are mainly open fields with minimum timber. Do turkeys require a lot of cover to roost, or should I glass over the crop fields as well? Any and all advice is appreciated. And thanks for helping a beginner hopefully let the hammer down on a gobbler this spring.
Thanks,
Dan