You wanting to use JC reeds or make your own wood duck toneboard?
Using JC reeds is pretty simple. Straight 1/2" bore all the way through your blank. Turn to shape. The biggest factor is going to be the length of your call. Play with that to get the sound you want.
If you're wanting to make your own toneboard... there was a post at some point where someone showed their end result. Not sure if it was a tutorial or not. But, it was basically an Arkansas style toneboard made very short.