I had the same problems when I started turkey hunting. I will try to sum it up as best I can....
Box calls- They make decent sound and are pretty user friendly. They are easy to yelp with but it gets a little harder make calls like clucks and purrs. The real down side is that it takes at least one but usually both hands to work the call. So if a bird is in close and your hands are on your call and not your gun he will see any movement you make to try and shoot. They have amazing eyesight and will see even the slightest movent and then they will be gone.
Slate/glass calls- Usually have good sound but a little harder to use than a box. Its a bit easier to purr and cluck IMO. the problem is like a box call... you are not exactly hands free so staying imobile is hard.
Mouth call- Usually have some great sounds and I think are easiest to make different sounds with. They are also great becasue you can call without taking your hands off your gun or have to move much. The downside is they are much more difficult to use. It takes alot of practice to get it making the right sounds and for you to get comfortable with it.
The truth is they all have their ups and downs. I would say start out with a box call. Get used to turkey sounds and how to make them. Then move to a slate.
I would deffinetly say there is no magic call in either make or style. You will see that most turkey hunters carry multiple calls of different makes. Alot of times some birds just dont respond to certain calls. Then you switch a call and they start gobbling their heads off.
It seems like you are on the right track looking into it now too. If you want to hunt gobblers this spring start practicing calling now. By the time spring rolls around you will be much more comfortable with your calling and that will greatly increase your chances. Dont get to cocky though becasue your first few times out you will likely get an "education" from the birds
Anther thing.... you dont have to sound like the perfect turkey or sound like the guys in calling competitions. Many times I have been in the woods and hear a clucking and think that its another hunter with horrible calling skills. Low and behold about 5 minutes later an old hen will come out of the trees. They are like people, they all sound different.
Best of luck and prepare to become addicted. Turkey hunting is a blast!!!!!!!:hump: