making your own call can be a challenge, but the rewards of using it successfully in the field makes it worth it. I've made over 100 hand calls from cow horn, deer antler, and wood, both enclosed and open reeds. When I get home frow work, I'll post a few pics. of some calls I've made.
I'll do my best to answer any specific questions you might have. I'd suggest making an enclosed reed call first, it'll be easier than making an open reed for the simple fact that getting the mouth piece on an open reed just right can be very tricky.