Easy gold

1Go to bandit camps. If you don't think you can take them on by yourself, find a follower (to get followers for free, just do their quest(s), and you can hire them with no charge, though with some you have to pay) Usually, if you loot both bodies and houses, there is a fair amount of money.
2Get in good with the Jarl. Seriously! If you get in good with the Jarl and complete all his/her quests and become the Thane, you can take almost anything to sell. Some things like jewelry cannot be taken without stealing. [ex. When you kill the dragon in Whiterun, you can not only buy a house, but take almost everything in his castle other then the things in his wizard's room.
3Steal. Stealing is one of the main things people do in these games to get money, it's easy, wear things that up your stealth, or get perks for your stealth.
4Join the Dark Brotherhood. Every time you report to the Dark Brotherhood after a murder, you get around 100-200 coin.
5Chop wood. You can chop wood, and sell it for about 5-6 gold at most pubs and mills. Though it doesn't pay a lot, you get 2 wood every time you chop one log, so each cycle, you chop 3 logs, so you get 6 firewood each time.
6Do jobs. Usually the jobs you get from the local people in any town pay well.
7Dungeons. You're thinking this one is too hard cause of Draugers and crap like that, right? Well it's really worth it! Usually, Draugers will drop from 1-30 coin, and when you finish the boss battle, you can either disenchant the weapon you get, or you can sell it for usually about 100-3000 coin.
8Hunting. Sometimes, animals will carry a small amount of coin from their last kill, or you can sell the pelts and meat for about 10-30 coin depending on what kind of pelt it is [ex. Wolf pelts are usually more then say, fox pelts, because wolf pelts are larger]
9Sell a lot. You're probably thinking, well we know that! But listen, look at the value of random things before you pick them up such as ingots, clothing, weapons, potions, books, etc. if it has a high value rating, then it's worth selling!
10 Join factions, do lots of quests. Joining factions means doing quests, and quests usually are fair pay (depending on the person and quest).
11Smith extra weapons/armor. Easy, when you smith things, smith some extras and sell them.
Source: http://m.wikihow.com/Get-Easy-Money-in-Elder-Scrolls-V:-Skyrim