Easy goal scoring at kickoff: This is a tough trick to pull off but can be achieved with practive. Choose a good team such as D.C. United. When you start off the match use your speed burst and run. About two strides before the other team's player, turn slightly and run at that angle. After passing the player, turn forward again. Keep this going until you pass the last defender and when you take your first stride into the box, shoot.
Also, before you start your game go to the Option Select Menu and set the "Golden Goal" option OFF to make it easier to score.