sound...

in my animation it would be a picture of a guitar and a hand passes by the guitar and it makes the sound of a guitar being strum....

for that i would need a guitar that moves from side to side with a motion tween. this layer would be called "guitar". this extends to frame 80. make a new layer and name it hand and then bring a picture of a hand as soon as the guitar stops moving in frame 30, the hand will move side to side like the guitar. this will be faster and it'll look like its strumming the guitar.  using a motion tween for the hand after the guitar stops moving. make a new layer and name it sound, insert a keyframe in frame 30. drag a sound of a guitar in to the library and then in frame 30'  u can add the sound so when the hand moves it looks like its touching and strumming the guitar. play the movie.