Well I usually brake down for the corner just a slight bit before I would if I were racing the track.. Then I keep a bit higher speed and turn in while dropping the clutch (my usual way of starting the drift, you can also just flick), that way I scrub off speed for it to be about right, then i just begin counter steering and basically floor it.
You gotta unwind the counter steer and relax the throttle a little on exit, the right point to do this is when your car is pointing in the right direction for exiting. If this doesn't get you out of the corner right, your entry speed is wrong.