Pre-recorded tapes of turkey calls can help you to learn the various calls and associated rhythm. Turkeys hear much better than humans. Before the hen comes off the roost, she calls softly. After you get in position, try giving a tree yelp while the gobbler is still on the roost. Another handy call to use is the cluck.
Turkeys frequently cluck while feeding and moving around undisturbed.
You can make the clucking sound on any of the calls. This is also one of the easiest calls to learn. The cackle is a series of excited yelps that hens sometimes make as they fly down from the roost. If you can't cackle well, don't do it at all. The fly-down cackle of the hen has been called the true mating call.