How to Arrange Several Transition Effects? (w/ .fla files)

New to Flash CS3. So Glad to find this forum!!!

I wanna create a flash presentation with audio and pictures. The pictures will display on a particular second-order with different transitions.
I have some difficulties of using AS3… :frowning:
You can see 3 swf files as below.
http://0rz.tw/5349V http://0rz.tw/1f4eu http://0rz.tw/794if
As to the first two, I had a problem of loading sounds. How to sutomatically play the sound in the beginning without pushing any buttons?
As to the 3rd one, I used TransitionManager to control the transition. How to add other transitions after the first one is done? (I wanna add 4 different pictures on a particular second-order: 3, 5.5, 9, 15 secs.
Download my source files here: http://0rz.tw/814dg http://0rz.tw/994g1 http://0rz.tw/ca4gc http://0rz.tw/a14ef
Many Thanks!