Yes I agree with Pacheco.
I would advice you to do this:
Go to the training ground (free training) and you have 11 vs 1 defender (the Keeper).
Now go to formation settings and put 8 opponents in (leave the strikers out).
You know how to put defenders in? No? I tell you
In the formation screen you press START and you now control the other team. Select 'participation' and now you can select the defenders by pressing X on them. Choose 8 players and go back to the training ground.
Now you can play 11 vs 8 and now I have some tips how to create chances:
If you make 1-2's, do it with side backs and side midfielders, because it's easier to do down the wings than through the center.
Try to cross balls after that 1-2 by pressing DOUBLE O. This type of cross is faster and easier to score with headers.
If you have no chance to do the 1-2 along the wing, try to pass the bal around to disrupt the defence. At that time you may reach a striker who can turn away from his defender and shoot at goal.
Hope it helps
EDIT: Just forgot to say that you need to switch off side ON (in general settings in training-mode) Else you get no good AI from the CPU.
Also, use the radar frequently!