Where can I start quest chain?
Nobody knows. Probably isn't on yet.
We have a green fire thread in our section OP but I'll answer it here; No information has been out yet other then warlock island, I suspect It's going to do in a late future PTR builds.
Armory: Rogue [Retired] | Armory: Warlock [Retired] | Armory: D3 [Retired]
The island for it is still WIP so it's probably not open yet.