The right side
Because - as you overtake the vehicle in front, high-beams will be reflected straight back at the driver - through their mirrors. Low beams are angled more towards the ground.
Both.
Use low beams.
You should use your low beams to avoid blinding the driver ahead as you lights reflect in his mirrors.
Yes, that would be common sense.
Turn Signals, Low Beams, High Beams and Flashers
As soon as you see a car directly in line towards you, you should go to low beam.
Should be like any other vehicle. (pull turn signal stick back (high beams on), pull it back again (high beams off).
500 meters
Look to the side of the road and at the white line.
150 meters
Flash by putting your high beam on and switching back to low beam