How to make money!
Yeah, hunting is the fastest way of money making fairly early on. Just kill, skin & sell every animal you find. That will net you some fairly decent money.
If you don't feel like doing that, depending on where you are in the game in terms of completion, Blackwater has a $100 poker game. If 4 other people playing & you win, you make a profit of $400 for roughly 10 minutes work (it takes me 10 minutes to win without cheating)
In Theives Landing, if you haven't already completed the corresponding Strangers Mission, the Liars Dice game is worth $200. Beat the two players there you make a profit of $400 as well. Again, roughly 10 minutes work. If you have played Liars Dice and won the property deed - but NOT taken back to the required person, the game should still be worth $200 until you end the strangers mission by taking the deed to guy.
Other than hunting, poker & liars dice, there isn't a lot of scope for quick, easily made money unfortunately.
Added by: Pravinj Jun 2nd 2012, ID#4697