If your really poor , you should fight easy monsters to save you from using potions and arrows or stars. Just save up money and sell the drops you get. If you get a scroll they should make you some good money depending on which scroll you get (check
www.basilmarket.com for price checks). When you reach level 21 you can start doing a party quest at Kerning City , at the end of it you can score some really good items to sell =].