Location location location...good scouting and good spots will prevail over good hunting skills 9 times outa ten. if your where they want to be it makes it ten times easier to decoy ducks, with barely a quack. Buy a dozen greenhead gear mallards they look great and are only like 50 bucks or so. When it comes to calling it is better to call hard to ducks when they are going away, not when they are coming to you, if theyre coming to you soft greeting qaucks and feeding chuckles should do the trick but as soon as they turn to head away thats when you hit them with a comeback call.
goodluck