New To AS3 - I might be dense

Ok so I have bought books and watched hours of tutorials
and its painfully obvious that I am not picking AS3 (or any scripting)
up very well.

I am creating a Flash Portfolio site and I am curious about the correct
architecture. If I have a central Nav with corresponding animations,
should the whole site reside on one stage or a new stage per animation?

If there is a FAQ or tutorial on Kirupa that covers this (I might have missed it)
feel free to simply direct me there. Thanks and sorry for any confusion.

OK so this is an incredibly simplified build of what I’m trying to do.