Organizing game [best ways] advice required

Hello,
I am putting together a game that essentially has a different part for each month of the year. I’m fairly new to Flash, MX 2004 being my 1st version, so I was looking for advice on limits of a .fla and libraries. Would it be better to compile each month as a separate .swf and call them from a main menu swf? I see lots of “how to load an exteranl .swf” but can you add a .swf to the library of say the main menu swf and have it made into one .exe when published?
This is my first foray into something this large so any advice would be appreciated.
TIA
Indoda