This is an old version of the HCOP manual, some techniques will be out of date, but generally this is a relevant document
How to Skate Like a Referee
Blue Line Positioning
Fitness, Skating, & Sight LInes
The Role of the Officiating Coach
Linesmen: Face-Offs, Icing, Offside, Awareness
Basics of a linesman in the 3 referee system
At 0:49, "each linesman takes one half of the ice". THis is no longer the case, you and your partner may switch ends as needed.
At 3:19, the linesman jumps on the boards. Linesman are encouraged not to do this. Rather, bump-and-pivot out of the way while facing the play.
At 4:19, niether of the linesmen held the benches. It is important that Linesman help the referee by communicating with the benches that they must wait at the end of the periods.
Note, this video is meant to be a starting point to develop your skills. It is not a Hockey Canada video but does provide basic ideas about lining.
At 3:16, the video states "...8 or so seconds then the faceoff will begin." In Hockey Canada, the home team has five seconds to change, the visiting team has five seconds to change, then the puck is dropped five seconds after the visiting team changes.
At 3:59, the referee calls a penalty. He blows his whistle then makes the single while he keeps skating. The correct procedure is to stop, wait a couple of breaths, lower your raised arm to indicate player, announce player and color, make infraction signal while announcing infraction then procede to penalty box.
Note, this video is meant to be a starting point to develop your skills. It is not a Hockey Canada video but does provide basic ideas about refereeing.