How to start legion quest line?

Hello.

I just hit 98 with my Horde Druid. i am trying to see how to start the Legion content since it starts on level 98 as I ve seen. and cant seem to find anything.

trying to get artifact and dalaran to Broken shores. can anyone help me please ?
Found it finally. the NPC does not appear on the minimap. for future reference for people looking for it. you must go outside your factions town (Ogrimmar in my case) and you will find it
so where would I have to go if I'm a troll druid ?