I'm pretty sure there will be enough quests for:

Start 3 jobs and rise them up to lvl ~30 just with the quests and instances around each of the 3 cities.
Get at least 1 job to 50 if not more.
Get to know the world and maps by wandering looking for more quests.

And by the time you are done with quests you will have 99 levequests for sure, and all the Gathering and Crafting quests at your disposal.

Also I've proposed a scaling quest system in this thread you my find interesting.