I would say to get involved with a hunt club, or organization, in your area and train with them.
Most, if not all, shooting trials have a "dedicated gun" that is the only person shooting, or even allowed to handle the gun. You never have to shoot a bird, or own a shotgun to participate.
As for extinguishing the desire, that's a tough call. With your new puppy, I personally would be using those seagulls for training. The "whoa" comes later. Birds that flush and take flight can be used to bring out the point.
In the summer time we kept our dogs in covered kennels outside during the day. It was a daily experience to find them both sleeping, or just lying n their kennels doing nothing, while songbirds and Bluejays were flitting in and out cleaning up uneaten dog food. Never stopped them one bit from going after birds in the field. As they get older, they know the game.
You'll never beat a lesson into a dog, you just beat desire out.