I make pot calls and just started making my own box calls, and I've been on pro staffs. My suggestions for a fellow just starting out would be as follows:
1) A Quaker Boy Easy Yelper-- cheap, easy to use, good sound. I still keep mine handy for close-in clucking and purring and such coupled with a mouth call or my voice.
2) For a box call, I'm currently enamored with the work of Al Shoemaker,
http://www.sscustomcalls.com/ . Contact Al and tell him what you're up to. He'll send you a field grade box you'll be using the rest of your life.
If you want to stick with a production call, I can still recommend the Quaker Boy Grand Old Master.
3) Pot calls -- I'm fond of slate, slate over glass and most recently added copper to my goto list. For strikers, I am fond of hickory, purple heart, and dymondwood. Check out this place:
http://customsawing.com/STRIKERS.html for some good strikers.
The also sell the parts for making your own strikers and calls.
I'm not an expert in the subtleties of mouth calls, since I do a fair job of calling with just my voice. However, I usually look for deals online that will get me several at a time for $3/call. You'll want to start with a clear sound single reed for learning and then work into the more exotic multi-diaphragmed raspy calls.
Having said all that, the most important thing is getting out and learning how to call. You need to get among the turkeys and have them teach you. Get out and start scouting and listen to turkeys at flydown. If you can't get out, listen to my podcasts (see my signature for the link) or check out Mike Battey's CD's:
http://www.wildtalker.com/WildTalker_Game_Calls/Spittin_Feathers_CD.html
