A pushpin type call is good for beginners. A slate type call (maybe a Primos Power Crystal) is a good one to learn with. You really have to work to rough up the calling surface on a crystal call but they're not hard to learn with and make good turkey sounds.
A good box call can work well too. You can be making turkey sounds on a box in a few minutes. Get a video that shows how to call turkeys, preferably one with real turkey sounds on it and practice!