Here is a simple warm-up drill from Cornell university that works on one-touch passing and moving the puck up the wall for a shot on goal. This drill helps develop better passing skills and also helps to warm-up the goaltenders. Make sure to tell the players where to shoot from.I prefer to keep the shots from the tops of the circles.
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Coach Nielsen's Ice Hockey Drills 
Great Drill – where does the passer go? Back into a line?
Typically you will have more players in each line than what I have in the video. The passer goes back in line and will eventually become the shooter.