A note on the arm swing; the arm swing shown is used for generating maximum possible speed. The technique was taken from speed skating and adapted into hockey. Only use this one hand arm swing when you are in low pressure or no pressure situations in a game such as on a breakaway before you get to the goalie or backchecking while trying to catch the skater with the puck.
Most game situations require 2 hands on the stick, such as passing, shooting, recieving a pass, stopping, turning, transitions, and most other game situations. The only time you have one hand is when nobody is near you and you need pure SPEED. For younger skaters it is important teaching them when to go one hand on the stick and when to go two hands on the stick. You don't want your players to always have 2 hands on the stick the same as you don't want them to always have 1 hand on the stick.