I was thinking about getting a duck, but I was not quite sure that type is the best for training or like good indoors (kinda like a dog).
Ducks are not like dogs.
Ducks are flock animals. While they can be kept as a single bird, it requires a lot of time on the human's part. Will you be able to provide enough attention to a single duck.
As far as breed - as a duckling raised as a single duck, just about any breed would work.