I found the information posted by a user on Wowhead very useful
They lead me to the start of the quest chain, which begins the " Aviana quest chain".
So, I took a lvl 60 character that I know was created after this content was current, and these are the quests I did to get to where I could eventually START the Aviana quest chain.
Beginning with the quest “Protect The World Tree” in Nordrassil, Hyjal,
After turn-in, pickup quests:
-> War on The Twilight Hammer
-> The Flameseer’s Staff
-> Flamebreaker
-> The Return of Baron Geddon
->Emerald Allies
The Captured Scout
->Twilight Captivity
->Return to Alyssa
->A Prisoner of Interest (inside cave)
->Through the Dream
->Return to Nordrassil
->The Return of the Ancients
->Harrying the Hunters (may not need to do this one)
->End of the Supply Line
->In the Rear With the Gear
->The Voice of Goldrinn
->Goldrinn’s Ferocity
->Lycanthoth the Corruptor (kill the wolf in the cave and it takes you to the camp [cut screen])
->The Shrine Reclaimed
->Cleaning House
->Sweeping the Shelf
->Lightening in a Bottle
->Into the Maw! (Step through the big blue gate)
->Forged oi Shadow and Flame
->Crushing the cores
->Cindermaul, the Portal Master
->Forgemaster Pyrendavis
->Return from the Firelands
->The Fires of Mount Hyjal
->Fighting Fire with anything
->Disturbing the Rituals