Drifting FF cars is considered "unnatural" in the world of drifting, but in the game it is actually easier than MR or FR cars. As you approach a turn, use the "Feint" motion and lock up the rear wheels by using the handbrake (R2 by default) and turn into the turn. You will begin to slide around the turn, but once you rear the apex you will usually need to pick up some more speed. Let off the handbrake then get back on it when the angle starts to decrease. You will have more speed to complete the turn.