Use the spell "Teleport: Moonglade" to travel to Moonglade. When you arrive, speak with Dendrite Starblaze in the village of Nighthaven.
The following spell will be cast on you:
All druids are welcome in the sacred lands of Moonglade, regardless of the current tensions in the Cenarion Circle between Arch Druid Staghelm and Keeper Remulos - Moonglade's guardian. Now that you're learning the ways of the Claw, I'll teach you the spell that lets you transport yourself there. Cast it whenever you seek Moonglade's knowledge or solace.
As for your first lesson, travel to Moonglade and speak with Dendrite Starblaze in Nighthaven about the path you're now on. Good luck, young druid.
"And so it begins. Father Cenarius. And so it begins."
Dendrite makes a quick, invisible gesture in the air above him. A slight aura of power falls over him.
"The first perspective of nature you must adapt to is that of the bear. I will put you on the path to understanding this aspect of druidic life, but it is you that must embrace it and propagate it - now and forever!"