eh.. if that just insert frame and you can put song into it.. however some of info and tips since u said noob in flash.. u migh want to consider thinking how your song is

at the properties panel got 4 option.. event, stream, start, and stop. while i arely use start and stop, stream and event can provide pretty useful soung..

Stream = the song will play as long as the frame within the song is put.. let say u got frame 1-100 put this 3minute song.. the song will play only till frame 100 and after that the song stop..

event = everytime event just one keyframe put that song with sync event.. the song will play from start to an end..

hope it helps.. free tutorials even you didnt ask ahahah..

you're most welcome...