Making money...

[Namine]

Something that always sell, and absolutely every class can beat them: Pecopeco egg card. (EDIT: Mr. Bloody beat Namin? to it...)

Get one and it is 2 mil of zeny or something in that region. Namin? thinks that by normal loots without vending, then it will be at least until around lv 70 before zeny starts hitting even the 6 digits... Indeed, just like most other servers, there is a need to select monsters if one wants to make zeny.

Quests such as the fishing or mining ones obviously generate fortune as well... Mining generates all the items that Mr. Oka has mentioned already, while Fishing generates healing items which reduce the time it takes to level for sir, or they can be sold by vending to other players for reasonable prices. The boxes that come from fishing are also decent to vend to players as well~

Making a merchant, even if purely for the purpose of overcharging, discounting and/or vending, is obviously recommended or even necessary to make zeny.