The players were exploring Stormwind City while trying to communicate with various NPCs and search for hidden missions in the city.
For example, class quests were actually triggered. Certain conditions had to be met and a specific NPC had to be met before they could be triggered.
Other than that, the players also found many other activities. For example, after learning fishing skills from a fishing trainer, they could fish in the canal of Storm City and sell the fish they caught for money.
There were also some simple errand missions, such as an NPC needing a certain material. As long as the player bought the material from a designated merchant and handed it to him, he could get a certain amount of reward.
If they really couldn't do it, the players could also learn how to skin and go to the entrance of Storm City to kill a few wild boars. They could also sell them for money.