Best way to structure a menu

I'm making a flash app which is basically just a menu (main screen). When you select a button, a new sub-menu should show up.

What I'm wondering is, what's the best structure for setting something like this up?

Should I have a movieHolder and load each menu in as required?

Also, I'm trying to think of a good intro & outro for each menu. Does anyone have any cool examples that might inspire me?

As of right now I'll probably just go with a simple fade-in + fade-out.

I would personally structure it based on an XML feed, or at the very least an array then script it. I wouldn't build it with static movieclips, etc like some are built.