Answer:
step 1: place the flute to your mouth
step 2: blow air through the flute
step 3: play the notes: e a a Dee e f(sharp) a gfe g g gg AA e a gg f(sharp) e d (above the staff now) a cbc d e d gaa
FYI
Stairway to heaven was played by the Mellotron, not an actual flute. This is why it sounds like there are several flutes being played at once timed so perfectly. The Mellotron was the first keyboard controlled sampler!