Shells and ducks. Those are the essentials
In all seriousness. You already have a gun.
Waders
Waterproof Camo
Calls as mentioned before
Decoys a dozen and one or two wobblers
A chessie or the other dog
Friend with a boat and blind
Permament Hall Pass from the wife/girlfriend
Snow cover up North
2's, 3's, and 4's in steel. I use Winchester Drylock or Supremes. or Hevi Shot 4's and 6's when I'm flush with cash. Normally You find me with 3's in steel.
You live just south of me. The ducks are starting to come down a little but they ain't thick yet.