This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Reach level 3 to learn Seal of Command. Cast Seal of Command on yourself and then hit a Training Dummy south of the entrance to Northshire Abbey.
As you continue in your journey as a Paladin, you'll become closer to the light, learning new abilities.
Go, get more experience, and learn a new ability. Demonstrate it for me, and we will continue your training.