Consult a fingering chart. Many instruction books will have one. The fingering chart will guide you through each note. Try any alternate fingerings. When playing the flute it should not sound like you're just blowing or whistling--it should be a full, steady tone.

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Warm up before playing. Octave slurs (slurring from the octave below to the octave above and vice versa) are good for flutes. Play a chromatic scale to make sure your flute is functioning properly.