You don't need a call, or a blind bag, or decoys (although they will add to your enjoyment), or a mojo, or a layout blind, or a boat, or a $4M lodge, or anything but a gun, some shells, a license, and A PLACE TO HUNT!
If you are in the right place at the right time, you will get shots at ducks. All you need to do is scout and find where the ducks want to be, then wear drab clothing, hide in the natural vegetation, don't show your face to the ducks, and don't move until they are WELL within range.
You won't know what to do with the call anyway...not for awhile...and won't have a need for all the extraneous gear we accumulate over the years. Enough time for that later. You just need to get the fundamentals down first. First thing to buy is half a dozen decoys. Doesn't matter what kind, what brand, what specie, what shape. Cheap as possible, because you'll be buying hundreds of dollars worth every year for the next 10 years.