Or just grind. Grind a lot.

In this section of the World of Warcraft leveling guide we are going to work our way through level
50. To do this you need to visit both Azshara and the Hinterlands to work on several quests.

When you enter the zone make your way to Talrendis Point at 10,78 and
collect the quests there. Make sure you get "*Spiritual Unrest*" and "*A
Land Filled with Hatred*".

See it at Ten Ton Hammer's WoW site.