Newbie: Strategy game questions

Hi all,

I have a couple of questions regarding the development of a strategy game:

  • I would like to use fog of war, but the only way I can figure out to do it is by using masks. Will it be too processor heavy in AS3? Are there any other techniques?
  • Regarding unit selection: I want to do the classic, Age of Empires-style click, rectangle, multiple units select. However, the only way I can figure out how to do that is drawing a shape (that is, a MouseDown function that draws a shape, which is calculated on the EnterFrame function), and using collision detection to check if a unit is selected or not (with a boolean). Does this make sense? Or, again, are there other approaches I should be aware of?

Finally, are there any good online resources for OO AS3 game programming? Specially for n00bs like me, where things about structure are explained (as in, MVC pattern, and similar stuff). My Google-Fu has not succeeded yet.

Thanks!