I can’t stress enough the importance of force fetch if you’re planning on duck hunting this lab. Find a reputable trainer nearby and let them do it. Your life will be so much easier if you do. I would even go so far as recommending the trainer do basic obedience as well.
Training. Your own dog is incredibly rewarding, but it’s easy to head down a rabbit hole of mistakes if you’ve never done it before or if you don’t have a support group of folks around you to help you and, more importantly, to inspire you to train. I say this because training never stops. Never. It doesn’t take much time each day, but it truly is something you have to stay with.
Lastly, if you go the trainer route don’t leave with your pup until the trainer has trained you. The smart trainers will insist on this. If they send a perfectly capable dog home with you, but you don’t know how to handle then you’ll wind up blaming the trainer and that’s bad for their business.