I started with the Custom Sawing kits myself. It's a great way to start! Just follow the blueprints they supply the first few times and take your time.
Once you get the hang of it you can get ideas from other calls you own that sound good to you.
If you stick with it and find you have "the touch" you'll be hand-carvin' calls outta mahogany blanks in no time. <img src=icon_smile_wink.gif border=0 align=middle>