Use the spell "Teleport: Moonglade" to travel to Moonglade. When you arrive, speak with Dendrite Starblaze in the village of Nighthaven.
All druids are welcomed to the sacred lands of Moonglade, tauren and night elf alike. Keeper Remulos - Moonglade's guardian - keeps watch over all druids who hibernate there. 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.