Ok, this (hopefully) will tell all of this story, set it up for ya. But if any part of it is not up to standard, feel free to point it out and suggest a change, I promice that I'll try and improve.
Prologue
There are many groups that believe in rebirth and reincarnation, to be life again after death, in a new body and new form. A thousand years passed since the time of the first Fire Lord Zuko and since the ending of the great Elemental war. A recent war was raged, just over fifty years ago, between those who can control an element, benders, and those who can't. The art of bending has near been forgotten and the world is falling into darkness. Old heroes and lives must be born again, or the balance will vanish completely and the apocalypse will come.
In the cold of the south is where the tale begins again, at the funeral of two sibling's mother.