If you can get some soulstones, you can play around with your thief template to aim for stealing powerscrolls and nifty stuff like that. That brings in good money.
The template you are making will be very good at faction thieving, and with some practice, you'll be good bank thief too. Ignore Dave, he's just annoyed that he'll have some competition.
Also, if you just want a money making character, you can do well with any pvm character like:
discord tamer
chiv archer
necro/sammy
Or, you can go crafting. That's a solid way to make gold.