Dungeons: This is the most common way of making money. The amount of money you can make varies depending on the dungeon. When going to a dungeon, remember to pick up the gold that you find on the floor. Also, if your teammates dont mind, you can bring mine bombs and mine some ore if it is available in the dungeon. You can also get an assortment of items from the dungeon as well, again, the type of item and the price depends on the dungeon your in.
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Fishing: Fishing is a great and efficient way of making money, however later on in the game dungeons will probably give more money than fishing, so I advise you to only consider fishing a source of money if you're low level or if you're out of tokens. The most important tip for fishing is knowing the approximate time the school of fish is going to appear. There's nothing worse than being caught off guard and missing a school of fish. You also try to join parties with at least 6 people in it. The more people in a fishing party, the more fish are going to appear in a school. There is also the chance of a Violent Tahtich appearing. Violent Tahtichs make a great profit if you know how to catch them. The fish you get from fishing also make a great profit as well. You may even be lucky to get some good items from chests such as ice crystals, silver ores, and gold ores!
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Stores/Marketplace: The stores in Vindictus are a good way to make money, you can sell the items you dont need, it may seem like a small profit, but it will eventually add up. In the marketplace, you can sell items to other players. This is probably how you're going to make the big bucks, by auctioning rare items you get from dungeons or anywhere else in the marketplace. Just be sure to check the price either in your inventory or searching in the marketplace itself, sometimes an item may sell more in the store than in the marketplace, and sometimes it'll sell more in the marketplace than in the store.
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Crafting: Crafting is a great way to SAVE money. You can craft your own feathers, potions, materials, and other things that you would normally need to buy from the stores or marketplace. When you buy equipment from the marketplace, they become untradeable, which means you can no longer sell it in the marketplace or trade it to other players, only sell it in a store or drop it. A great way to get the equipment you want is to craft it yourself, when you craft it yourself, you can use it until you level out of it and sell it in the marketplace, leaving some other sucker who buys it to deal with it. If you find it difficult to find the materials to craft what you need, you can buy it in the marketplace, the price of the materials combined is about the same price of your equipment so it's basically like getting your new set of equipment for free.
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One more thing about saving money, don't dye, it may seem tempting when each piece of your armor is a different color, but unless you are rich and dont have anything else to spend your money on, I suggest you don't dye.
I hope this guide helps you on your way to becoming rich, or if your already rich, even richer!!!
Thanks to PandaSong for reminding me about dyeing. =D