JW had several good points. One thing that I wish I could have learned earlier is more patients. There has been several times where I got up to move and scared a bird away or when stalk a gobbler, I would say to myself, "if I could get to that next tree I would be golden", just to be spotted by the bird and him take off. Patients is a big one.
When it comes to calling, I would start out with a slate. I like them because they are easy to use (as is a box call) but you can also use them in "quiter" situations. Box calls are hard to use when a bird is close by. I would also get a mouth call. They are hard to use and you will probably get frustrated when learning to use one, but they are the most versitile call. A moth call allows you to have both hands on the gun and ready to shoot while still being able to make soft calls if necissary.
You can hear turkey calling sounds for free at
http://www.nwtf.org/nwtf_newsroom/turkey_calls.html as well as many other places by doing a google search.