-First, get to level 20. Kill Flying Roosters. They drop many types of swords. When your inventory is full, sell the swords to the blacksmith. Do this repeatedly and you can get 10,000 easily.
-Make a female warrior and get her to level 40 at Bird Island, then get 500 silvers and put them in the warehouse. Go to the conductress and go to Desert City. Go in the portal then fight the guards to intentionally die and be revived there. Purchase a scroll from the pharmacist, and then go to conductor and go to Mystic Castle. Enter the portal and lure Tomb Bats. You can collect money and good items that can be sold.