Rookie Dificulty

When you are on Rookie Dificulty, and you want to score a goal, you skate just over the Blueline, and then take a slapshot and aim it to the top left or top right corner, depending which side you come down on.
 

Pro Dificulty

This is a little harder to score on.  I found that if you keep your offensive pressure at 60% and your defensive pressure at 60% using the combination, that you'll come up with a turnover 5 outta 7 times.  The best way to score on Pro Level is to keep shooting at the goalie repeatedly.  Make sure your players are infront of the opposing team's net (otherwise your shots will be pretty much ineffective).