An allright start
For the music, it's just to import it into flash. Nothing tricky about that, just go to File -> Import -> Import to library (or stage) and then drag the mp3 file into the flash (I suggets you have created one layer for music)
Now for the main animation, it wasn't very high tech or anything, but I know what it feels like to try out a program and kinda dont know anything about it. For a guy that just got into flash, I'm not disappointed, I'm a little impressed. Watch my flash animation, it's my second flash animation (in my whole life) and I haven't started animation in school yet (but, the school that I'm attending to isn't a school for animation, more media, web-design, photo)
And! If you REALLY want to be good in flash, I suggest you take a look at Chluaid. He got som pretty sick animation (everything is done in flash, he changed program now, but his older work is done only in flash). And type "Flash Animation" on Youtube. See what others have done and try and find something that's suited for you. I'm currently learning only by tutorials and trying things out.
Hope this was to some help, not much to be said about the animation, maybe have a plot in the next one? and perhaps some music now that I told you how to do it.