Getting level and money fast

You can easily get money by accepting the task to kill tarantulas. Leveling there until level 50 will yield a lot of gold. At level 50 when you're done hunting tarantulas, you can finish the In Service of Yalahar Quest and start the task to kill Mutated Rats. Here too you will gain a lot of money and experience.
This tip is best suited for Mage and Paladin but should work for knights too.