While it is always possible to earn the necessary gold you need through the game, this is going to take time. There is only so much you are going to make while playing the game on your own, which is going to make it difficult to purchase new weapons and goods for the game. You will need the very best weapons, spells and other material on hand in order to keep your health and spell casting ability up, not to mention you'll need items in order to repair your armor and to pick locks, so all of this is something you need to consider. By purchasing eso gold online, you are able to expand upon the amount of gameplay you can do, and with stronger armor, you'll need to have more money on hand, and buying gold online is going to help you. I recommend you to go to MMOBUX.com to see which shops offer the cheapest price available.
If you want to farm gold yourself, a good MMO gaming forum like strategyfreaks.com is a place you should go.