In the interest of serving part-timers like myself, who haven't beta'd or know where they're going on Tuesday...
First off, most say to buy Old World Flying from Bralla Cloudwing in Stormwind first. The comments there on WowHead suggest 250g is the gold sink.
You've then got two choices of where to start, apparently. First, it sounded like Vashj'ir would be an interesting place to start, as I ultimately enjoyed the Indian-themed demons from BC. But then it turns out the entire zone is under water and that you end up riding seahorses or something, nearly or more wack than the Draenai spaceship storyline I'm still essentially ignoring.
The other choice is Mount Hyjal, which is even better because you're apparently helping save Nordrassil, the other world tree.
The Mount Hyjal quest line is also easy to access. You click on one of the help wanted boards in SW or IF or Darn and are told to go all the way to Moonglade. That's tough for druids to pull off, right?
Mount Hyjal is one of the two 80-82 level-up zones in Cataclysm. Breadcrumbs come from Stormwind and Orgrimmar from the Hero's Call and Warchief's Command billboards, which send players to Moonglade. There, the breadcrumb As Hyjal Burns directs players to the zone, where the chain proper starts underneath Nordrassil, the world tree, with Inciting the Elements and The Earth Rises.
That should last us a while.