As I've recently begun playing the EASHL with some friends, I've put together two basic examples of the zones each player by default should try to stick two.

When attacking, the wingers really don't have to stick to a specific side - their job is to go wherever they are free to recieve a pass/take a shot.

While on defence, you want to be as close as possible to the opponent in your zone while still being between him and your goalie. Try to anticipate his moves and move to the spot where you think he will be in a second. Don't overcheck as this, often, will result in you getting out of position. If you pokecheck instead, you have a better chance at keeping your desired position even if you miss the puck.
Players getting out of their defensive position breaks down the defence and often leaves it in a state of chaos - which a good team takes advantage of.

If you're not about to check - use vision control (L2 - PS3) so that your player allways faces the puck (works in the same way on the attack except behind the net where you'll face the slot).

D=pink
C=blue
W=yellow

Attack:




Defence:



The green circles represents the most important zones to defend for each player.