A good pair of binoculars is an essential part of my waterfowl hunting gear. In fact, I never leave home without them. Scouting for birds before your hunt is a great way to put yourself where the birds want to be and some quality optics will let you see farther and more detail. I also use them when I am hunting to see if birds are using other areas around my location.
You need a quality waterproof blind bag or small backpack for keeping ammo, calls, gloves, and other items organized and protected.
There is a ton of gear available for hunting ducks and geese nowadays. If you are just starting out it can seem overwhelming at first with all the options out there. You don't need to go out and buy the most expensive stuff there is but you also get what you pay for. Don't skimp on a good waterproof jacket as the longer you can stay dry the longer you will be able to stay in the field. Buy a decent call and practice, practice, and practice. There are lots of instructional videos out there on calling.
High-quality snacks and hydration supplements will help you keep your strength and stay hydrated meaning you will be able to stay in the field longer.
I like Heather's Choice. Here are a few options.
Quality clothing can make or break a hunt in nasty weather. The longer you can stay in the field the higher your chances of being successful. If you can afford it buy a good jacket to start, it will pay off in the long run.
There are a lot of options for shotguns out there and prices can vary from one gun to the next. Lots of birds have taken for years with pump-action shotguns. They are popular because they are cheaper than autos, reliable, and multi-use. A lot of people choose autos because of recoil reduction and fast follow-up shots. You can always start at the base model pump and work your way up to a more expensive auto down the road.