[Messianic]

Take either the Magician or Druid and level on spectres.

Take the magician and go farm halfling guards or High Keep guards, and sell the things they drop.

In short, most of the money you'll make will come from hunting the right mobs. You could also speed-level to 49 somewhere then go to seafuries on your mage and just sit on top of the spawn points of some of the seafuries and you'll do okay.