There are several quests you can complete to get money. There's a very easy one, and you'll get around 800 coins for doing it.
You've just got the quest, so I suppose you're somewhere around Matras. Talk to Mayana, the streetwalker near the port, she'll ask you to rob the innkeeper. At night, hit a window that's not lit, and you'll find the gold, and some items. But you'll have to give Mayana back at least 250 gold when you tell her you did what she said.
Hope this helps. If not, write.
