Yep, if you want show style birds go with the calls.
As for the wild birds, I had over 100 species of them for 20 some od years. You'll never get tame wood ducks, you get them calm, but nothing like calls.
The permits for migratory waterfowl are given to you by the breeder who has to be liscensed to sell them by the U.S.D.I. Division of Migratory Waterfowl Permits Section, the state DNR has nothing to do with it, it's Federally regulated.
To own them, this receipt the breeder gives you is all that you need and is free. If you wish to sell them later own, then you have to buy the permit, which was only $25 back in my days with them. I wish more people would keep them as they put the domestic birds to shame when it comes to color, the woodies are just a drop in the bucket. Now that I am back on my family farm finally, I fully intend to get them all back,
But, no, they arent intended for shows, never heard of a show classed for them either.
Good luck, you'll love any you do decide to go with, I'd recommend the snowys, or butterscotch call, I always loved their colors..