You can make vibrato effects on your flute. These are tremulous or pulsating effects produced by small and rapid variations in the pitch of a note. They considerably enhance the quality of sustained notes if done well. To create a vibrato effect you generate puffs of breath while sustaining the note. Try a belly laugh while playing a note.
Vibrato is most effective if done in a subtle manner.
Tonguing helps to shape notes. As you blow, silently say too, or doo. When done successfully, your notes will have a nice pure sound. Trills are sometimes called grace notes or ornaments because they are not part of the song but simply embellish some of the notes in the song. To make a wailing sound, start each note softly, then more and more loudly, and then softly again.