One Reincarnated Firebender Journey

A guy gets reincarnated in ATLA as a fire nation soldier a week before Zhao attacks the Northen Water Tribe. My knowledge of the world is a bit scattered, been a fucking while, so i will have to go rewatch the episodes of book two for better context, updates will not be fast. Power progression will be linear, he won't be able to fight azula after three chapters, it takes years to master bending and the Gaang is already hella fast doing it in one and they still admittedly have a way to go except maybe Aang himself. First time writing, plz go easy on me.