Get into playing position, sitting up straight in front of a mirror, turned slightly to the left. Bring your flute up to your mouth using the good hand position from lesson 7. Make sure your embouchure is set, finger the note, take a good deep breath (into your feet), and tongue the note. If all goes well, it should sound something like this:
Aim for a clean, clear tone with very little breathiness. If it doesn't sound right, check to make sure you're covering the holes properly. Make sure the keys are closed all the way. Make sure the blow hole is centered on your lower lip, slightly covered, and that your flute is at a right angle to your body.