SOUND
Find some good sound effects that help emphasise the action
File Import>to Library
Timeline > new layer>Create blank keyframe where you want the sound
Drag the sound from the Library to the Stage (to where your animation is)
and see here...
https://www.youtube.com/watch?v=kmhzQ1JSd4Q
https://www.youtube.com/watch?v=TFYe7Xgw97Q