Hold on there skippy!
First Off.. Dont ever buy guns from walmart! Everything valuable that walmart carries is more often then not made cheaper to meet walmarts demands for pricing! And if you have not yet purchased a hunting licsence your gonna need that safty course card! You can go online and get anouther card from you state game commission! IF your going to be getting your shotgun for waterfowl, then i would suggest getting a Remingtion 870 express Magnum! It will chamber 2 3/4 and 3 in. shells which is what you want for ducks and it wont cost you an arm and a leg! But just because the gun isnt expensive, dont think it lack quality! It is the perfect all around shotgun for a begginner! 12 gauge by the way! When you buy a new hunting licsence you should get all your regular tags! each state is differant but you will also have to go to the post office and get a Federal Duck Stamp for 15.00!
Hunting without it is a federal offense so make sure you get that!
IN Pennsylvania you need a migratory game bird licsence also! But i know New York is differant as far as regulations go! So check out the game commissions website and research there!