Try something that is in demand. Like weaving for fine fabric and thin and thick yarn. Metallurgy and mining can also make money (Mabinogi Gold) fairly quickly because people use ores for refinery and people use the unknown ores for alchemy. Enchanting is pretty good too because everyone will want burns from the items that they want. They will usually turn to an r5 enchanter with 200 int for their high burn rate.
Blacksmithing is great because everyone will want to buy quality weapons/armors that have a nice color from you. Cooking is probably the best life skill in terms of money making in Mabinogi because it makes money quickly off of the npc monkeys in zardine and does not take too much time and space. If you want money without nx then r9 cooking for monkeys and Advanced Dunbarton part time jobs are for you. We have got chr.s with r