The First Buzz
 

Use a metronome. Set it to MM=60. Take in air on count 4 (after breathmark) and close the lips by saying "UP". Then try to make a buzz with the lips by using the sound POO. Keep the tongue down and use the syllable P. If you can hit a low C it is good, but the pitch is not important here. It is more important to aim for a relaxed buzz. Be very exact with the rhytm. Repeat 5 times, then take a rest.