Try to shout to sell weapons
Those with good stats will sell for more (ex. end&str for fighters, int for mages, etc.) Look for godly weapons
(ex.lvl 40 wep with stats +20) That way you can shout and make money on the go. I don't remember lower bosses, but around 40's try GK (Goblin King)in Goblin Camp, GGK (Concealed Peak through Goblin Camp), or Robo (Vine Tomb). Here are some guides found in the Fiesta Wiki which may seem useful to you.
Money Making:
http://fiestafan.com/wiki/index.php?title=Money_Making
Getting Started with Production Skills:
http://www.fiestafan.com/forums/showthread.php?t=793
1Free Level or Infinite Fame+Money (only if you have a lot of time for vending!)
http://www.fiestafan.com/forums/showthread.php?t=3285
Farming/Harvesting Locations:
http://www.fiestafan.com/forums/showthread.php?t=3892
Here is a link to the Guide Index:
http://www.fiestafan.com/forums/showthread.php?t=4556
Making Money:
http://fiestafan.com/forums/showthread.php?t=7889
Enjoy !
Sorry if some of the guides are nothing new, like starting production skills. I'm not sure if you're new to the game...anyways welcome to FiestaFan !