You should be able to train for a WC on your own without much difficulty. If you want to go further, you'll probably need the help of someone who knows what they are doing or a club.
I imagine its the same in the US as Canada. If you can get a dead duck to train with the better. But the land is a reasonable distance (don't have # in front of me). You can train that by having a friend toss a bumper for you, while you keep your dog sitting at your side (you can hold collar for WC) and send them to get the bumper when you are ready. The water portion is 2 bumpers, 2 separate retrieves. As long as the pup will swim and will get the bumper, and do this repetitively, you should be fine. But it will be done with dead ducks.
I would plan on watching the JH...the rest is pretty advanced and while interesting, it could be a LONG day or multiple days and for your immediate goal, JH is the closest.
I would check in with the Hunt secretary, tell them you are interested in the club, in membership, in WC's and find out what they have to say about that.
I would imagine YouTube would have some videos on people running WC's. There are some little training things for YOU like learning to signals the folks tossing the ducks for the retrieve when you and your dog are ready, learning to send your dog on their name or a chosen word...
The clubs I am affiliated with for labs, have practices but nothing regular and you need to be in the loop to get the notifications. My club for my griffon (a pointer), they are a bit more organized and they are training towards their version of the WC called a NA...for versatile hunting dogs.