I hunted my dog last year in the upland field. This year I'm taking her to the duck blind and boat with me. Before you duck hunt with her, take her in the boat, set everything up the way it will be on opening day. This way you won't have to get her used to knew situations during duck season. Sure some will come up, but if you can eliminate most of them, it will be for the better.
I would try and do some dove hunting before season too. This is going to be my biggest practice for live hunting situations. It's alot easier to correct stuff on land while dove hunting, then in the water while duck hunting. Good Luck and remember you have plenty of time.
"Because a duck is just a 3 pound critter"