Practice on a bottle to learn how to blow into a flute. Glass or plastic works equally well. Blow across the opening to produce a sound. Make sure the opening is not too big. An easy way to learn the flute embouchure is by making an mmm sound, and then a p sound while pursing your lips. However, when playing the flute, you should be making more of a "too" sound. You should also be blowing slightly downward in order to make a note. The less liquid in the bottle the lower the pitch and the more liquid the higher the pitch. This blowing technique is the proper way to ease notes from a flute.