The guide that's here already is good, but I thought I'd go more in depth on how to actually get the points easily in Be a Pro mode. You should be able to get drastically more points per game than 20. I play with 5 minute periods and average well over 50 pts a game. Actually just scored 81 goals against Columbus as I was typing this up.
First, you want to definitely be a center. With the exception of a faceoff on the left side of the offensive zone (I won those to my right D), I won every faceoff with a deke. You can do this easily with the sliders in your favor by just holding LB and up on the right analog stick until the puck is dropped. There is no need to time it correctly.
I found the easiest way to score was to just glide towards to goalie after winning the faceoff at center ice and to watch where the goalie was positioned. Based on the look the goalie would give me, I would deke to the side he left open and score 95% of the time. If he is far to the left or right, you can actually just shoot and score most of the time. Here is a video of what it usually looked like:http://www.easports.com/media/play/video/115851949
Also, keep in mind that the defense will never poke the puck away from you or hit you. You can skate right up the middle at the goalie with no problems. The only way you'll lose possession is if you fall from turning too quick. For this reason, I never called for passes that could be intercepted. I took the puck deep in my zone (the occasional times the other team got it) and took it all the way up ice.
If you already have the BAP achievements that correspond with PP and SH goals I would recommend turning off penalties since it slows down the game a bit, but it's not necessary by any means. I played with icing, offsides, and penalties all on.
Good luck and comment if you need any help.