i play on the DS3, manual, everything off.
I use DS3 & ABS 1, manual, everything else off.
Basically you approach a turn, start into the turn like normal but then quickly handbrake to lock the wheels up - this will send your car's momentum into the wall at the back of the turn - so to compensate to not go off course, you accelerate to push the car's momentum back onto the course, and you'll notice that if you just did that, you'll start to probably (depending on the course and your skill level thus far) lose control in the next part of the track, so you'll then need to learn counter-steering.
Counter-steering is the basis of drifting - your car is trying to go outwards, you're forcing it inwards, and your tires are directing it along the path, because your rear tires should be so poor they don't actually accelerate you into the inside of the course but instead move you sideways. You don't have to be going fast to do this, some websites recommend you approach turns at 60kph, however once you start getting good you can be doing it at much higher speeds, the trick then is to use more grippy tires to cancel the outwards momentum into forwards (then sideways) momentum (this is less necessary for wheel users because they will have more control with worse tires).
Tips:
If you are going to far into the outside you either need to reduce speed upon entrance (if you hit the back wall per se) or your tires need to be upgraded (the worse tires you have the better though, to a point..) OR if you're going to far to the outside (and end up with little/no speed coming out of the drift) you may need to not be accelerating so much during the drift, the more you accelerate, the less your car is being pushed forwards at some point (I use track edge real so this might be different for low) and you'll just slip off the track, the opposite is then true; the less you accelerate, the more your tires are going to catch and then it will send you into the inside barrier but then you wont be drifting you'll just be counter-steer driving, so there's a balancing act in play when you're actually in the "drift" state.
I can't say how to gear because it depends on the situation.
I can full lap drift with a ds3 so this blurb must be somewhat true.
To sum:
1) Approach turn, don't be afraid to slow down at first before the turn and then gas towards it at the speed you think will pull you through while you're learning. Aim to "throw" your tail-end around the turn
2) Handbrake (throws car out), Gas 100% (makes wheels suddenly lose grip) and feather (starts retaining grip, to propel the car around the corner), steer wheels towards turn exit
3) Keep feathering throttle and directing your car's actual force at the inside of the track but steer where you want to slide
4) Straighten out wheels at the end of the turn.
5) If there is another turn, you can go right into it again, handbrake, gas, feather + counter steer
As you learn you'll start to automatically be braking mid-drift to reduce your speed for the next turn, or gassing to increase speed should you need to drift up a hill.
Happy drifting.