Welcome to the forum Hunter 28. Wow, you have asked a few questions that would take more than ample space to respond adequately, but first I would start by contacting someone who duck hunts locally in your neck of the woods and pick their brain a bit. You may have a local expert that could give you some quality tips and let you know what calls, spreads, decoys, etc work best where you plan on hunting.
Most of the time, you can't go wrong with a few mallard (drake & hen) decoys, and a few widgeon or teal deeks thrown in, as well as one or two pintail thrown out in the spread in the shape of a "J" or "W".
The best advice I can give you is to set up with your back to the wind and don't shoot until the ducks have just about landed in your decoy spread (ie....webbed feet thrust out). Be prepared to retrieve every duck you've shot either by yourself or a trained dog and know the Federal migratory game limits and which species of ducks are actually in season! And don't scare away the ducks by blowing the calls too much, let them do the talking once they get close enough. Keep your head down, don't move and don't look up into the sky like a tourist.
Maybe Dustin (our resident duck expert) can weigh in on this topic. Good luck.