You will be hunting in a blind, most likely a box like enclosure over a concrete drainage ditch. Find some camo material to cover the blind. Second, you will need decoys - snows of course, maybe come confidence decoys. Texas rags are good for building up a spread and some shells to fill in around the blind. There are many methods of placing them, tear drop shape is one, I like an X with the blind at the bottom near where the X crosses. Don't put the decoys too close (frightened birds huddle up) about five to ten feet from each other and family groups a little further apart. Family groups are three to five birds. Lastly, get a snow goose call and practice. It is not hard. Just say "Haw" into it. Snows are vocal; they have murmurs, yelps and barks. There are some CD's out there that cover it and some web sites, too. Other stuff like flags and string o wings such can help. The most important thing, Luck.
Living large in the southwest.