I had just gotten my new spell in Wizard101's Wintertusk and had no way to find my next quest. I tried my quest book and there were no quests there! I talked to all the quest givers that I had recently encountered and still nothing. Finally a friend suggested I go to Merle Ambrose. That turned out to be good advice... He had a quest for me! huzzah!
Anway, the rest is history. If you get stuck with no means to find a new quest on test realm check with Merle Ambrose. He can probably help you move along to your next quest.