Water dog is a good one. I hear people say that it's not a good one, because it doesn't cover Force Fetching. Well i've seen jam up dogs that weren't FF'd and top trial dogs as well.
A regular Joe can train a field trial dog, it just takes time and dedication.
Don't buy said puppy, bring him home, play with it, teach it to sit, fetch and leave him in the pen.
For 10 minutes a day over a few months, you can create a duck fetching, retrieving machine. I've done it, a few minutes a day.
Get about 5 bumpers, a 30ft. check cord, you don't need a shock collar either, and save some ducks/wings for the freezer.
I've seen too many good dogs go to crap with people that use a shock collar too much, takes the drive away from some.
Easiest to train, Female blacks are suppose to be it, I've had everything. Blacks seem to be good, and females are less stubborn. But i've had some that were. Get a good bloodline, and not just look at names, see the parents work. Don't buy some hyped up 40# ball of fire unless you have lots of time to work this dog. And having around $500 to buy a pup would be a good start.
It's not hard to do, just a little time daily and remember it's a puppy, they don't understand much english, no matter how loud you scream it or what extra words you yell.