Turkey hunting is difficult even with a shotgun. But it's exceptionally difficult with a bow. I'd recommend you learn to hunt turkeys with a shotgun and then use a bow once you learn the basics. I know several excellent bowhunters that wound more turkeys than I'm comfortable with before they get a bird. And these guys know how to turkey hunt.
Turkeys will spot you in a heartbeat in a tree stand. They are constantly looking for sky predators. Get a pop-up blind, stay on the ground