Here is a short guide for inducing a drift clicky.
Also practice in an easy car to drift in TDU like the F430, XJ220 (in my opinion) or some G class cars. TDU has a nasty drift/grip level and you need quick reactions if whilst drifting, the car suddenly grips again otherwise you will crash rather quickly. Once you get used to the drift/grip levels this shouldn't be a problem but it can put people off of drifting in TDU.
I normally use three techniques to drift (which I think are the most important to learn), the handbrake, clutch kick and feint techniques, then it's just a matter of countersteering and throttle modulation.
Drifting in TDU is only really possible in hardcore mode because it's more simulation, you just have to beware of hill and bumps.
I will understand if you are confused by most of the above, it's quite late for me and what I have typed may not necessarily make any sense :confused:.
I'm sure someone else will come along and sum it up in a few words ;).
Kelvjy