[HajiShirazu]

Hi,
There is only one technique to effective offensive in this game, called the "studda step."
Run your player at a 45 degree angle to the line of scrimmage toward the sideline and then completely let go of the analog stick, and press the juke toward the sideline. If you do it right, your player will do a "studda step" like juke where he kind of fakes forward and then "slides" to the outside. The defenders are terribly stupid against this move, they are totally paralyzed for an instant and just start running in the wrong direction before recovering. It works best on a counter or slam play, you immediately start doing the move as you get the ball and just do it over and over, making your way to the sidelines. You can consistantly get 15 yard gains this way and if you're any good you can use it again back toward the middle to get past the safety who is usually the only guy in position to make the tackle(the opposing d is often around the hash marks when you cross the line of scrimmage near the sideline.) If he does the thing where he bounces up off the ground you did it wrong. The key is to make sure you let up on the button completely, but still have your player moving forward a little due to his momentum when you press the R1.
There is also an onside kick technique that you can get back about 80% of the time but I can't remember how to do it. I used these two to win by 250 in a 6 minute quarter all madden game, with Trung Candidate breaking the 1,500 yard barrier in one game.