Here's a link for Directpadpro you might find useful though I havent a clue if it helps for USB since mine is also a LPTI pad.
Also a few simple control tips that may seem obvious after you play a while but might be of use to newcomers.
Tap W repeatedly + direction when ball is in the air to head it
Press and hold A for a flat and low lob .
Tap A to chip the ball.
Pressing and holding W causes your keeper to run out from your goal when an opposing player is approaching your goal.
Shift or Space key + left or right causes you to push the ball forward or backward.
Shift or Space + up or down causes your player to shimmy
Press and keep the Q key to get your players to make runs foward freeing them for open passes.
A very basic though useful tip.
If you find yourself in a one on one situation with the goalie or in the box TAP the D or shoot key instead of pressing it to slot the ball into the net.
Particularly useful if you find that you're always putting the ball over the crossbar.