This quest is not available in game.
Search the outer ring of Ironforge for John Turner.
Your task then, <name>, is to find someone here in Ironforge that is in need of aid. Someone who is pure of heart and motive. Perhaps someone helping others. Perhaps someone in need of a guide. Regardless, the person must have noble intent and be relying on your kindness.
Do this, and return to me when you are finished. Then, we shall discuss more of your path and what it means to be a paladin of the Light. I will remain here in the temple for your return. Other paladins will need my guidance also.