Pay for flight paths
Read the class and race articles for more descriptions of each class and race. One important note to make, however, is that not every race can be every class. For example, there are Tabula Rasa credits no gnome priests or paladins because gnomes believe in technology rather than a higher spiritual power. Money is needed to purchase items from vendors, train your character skills, pay for flight paths, and learn how to ride a mount, or acquire a few other generic services like purchasing bank slots.