hello i am here to tell u all that in the avatar book 1 and 2 aang learns to bend on chapter 9 in both seasons. perhaps in book3?? aang will learn his firebending in chapter 9.

It's a fair theory.?? Though, it will depend upon who is going to be the bending teacher.?? If it ends out being Jeong Jeong, then it likely will be episode 9 since they'd have to go find him.?? If it turns out to be Zuko or Iroh, it could be earlier depending on what happens to them by the end of Book 2.?? Again, it's a fair theory than only time can disprove.

My guess is that is gonna be earlier, I have a whole picture(well I can dream...lol) of the 3rd season....
I think they gonna be a very long time inside Fire Nation. Well who know, I guess i??m speculating, I??m sorry...

But your theory makes more sense than most.