Do you know some one that hunts waterfowl there close to you?
If so it would be better to talk to them and let them explain things to you.
There is a lot to know about waterfowl hunting and the law. You need to know your different ducks and geese and be able to identify them in flight.
I know this does not answer your question. But it sounds to me like you need to learn more than just how to read a box of shells. Steel shot is what the law says you have to use. Lead is out. You can not use lead shot.
If you lived close to me I would be more than happy to help you.
Good Luck on learning and hunting.
Always Hunt SAFE.