Umm... teach me! Seriously, tips?
Teaching with just words isn't easy, but I will try.
Best way to train is to use the tour event, because for the easier one, you don't need to worry about the brake, only throttle and ebrake.
Go into a drift section ( or even before ), steer and tap the ebrake. This start the drift. From there, you control it with steering ( turn in direction of the corner ), and counter steer ( opposite direction ), and throttle. In more powerful car, you will need the brake, as you easily reach speed exceeding what is needed for a corner.
The most important part is to "feel the drift". If you drift at full throttle, it will be longer, but you may hit the outside wall. Throttling ( I mean, ease your foot off the accelerator ) means shorter and sharper drift. Of course, you should manage your throttle during the drift. Most of the the time I go full throttle, but there are few exception depending on the corner.
When attacking a drift section, I start from the outside. Most of the drift are just one time steer and you could let go of the stick/wheel from there, with a bit of counter steer at the end if needed. Ideally, you should do this! ( it's really possible in Driveclub )
http://youtu.be/wZiLf-8FwD8?t=1m13s
Special case are long curves and chicane. Those need high speed and you need to steer during the whole drift. I just go with some tap of the stick.
Also there are some drift section where you need a double drift, in the opposite direction. Most important part in doing that, is the timing of when to start the second drift.
Here are some example.
http://youtu.be/AQJA-tms0fQ
All Britain Drift event. I use the McClaren 12C. Note that first drift you can get more points but I needed more speed. Second section, I need to have around 200km/h, else I can't drift during the whole section. Bit of steering, ebrake, and I steer, steer, but little by little with several tap of the stick during the 6 seconds of the drift. Also, I go full throttle IIRC. Last corner I also steer several time during the drift, though I'm a bit more frank there. In fact, I steer more when I feel that my drift is going to end.
https://www.youtube.com/watch?v=i0Lqo1obPHo
Limited Slip drift event.
First section: I brake, throttle, steer, and counter steer at the end.
Second section: full throttle, steer, and counter steer at the end.
Third section is trickier as it's a slight curve ending with a 90° corner. Going full throttle, I steer until I have the good direction. This is done in the first half/third of the drift, then I counter steer until the end where I adjust the angle to exit the section.
The remaining sections are like the second ( with some throttling if needed ), except the last which is more like the third section.
There you go. I hope it can help you.