There are quite a few places where you can write and earn money online. Besides that, you can also add ads to your articles so as to earn extra money but all these takes time, and I mean, alot of time is required. Not forgetting patience too.
The first place will of course be Triond. It is a good website where you can get to earn some extra income. You can write about everything under the sun and the minimum payout every month is $0.50. It is not easy to reach this amount but if you were to write 1 article every day, you can get at least $0.50 per month. Slowly, as you explore, you will know what are the topics you should target so as to earn more money.
Another one will be Factoidz which you can earn more because they have activity bonus. The only difference is that you have to write informative posts. There is no limit for payout. You will get your pay every month even if you were to earn $0.01.
The only special thing about Triond and Factoidz are that your articles have to be original and cannot be published anywhere on the web. Other than that, they are good sites that can earn money.
There are also other sites where you can earn money. They are Wikinut and Bukisa. You can repost your articles published on Triond and Factoidz at Wikinut and Bukisa so as to earn some extra money. The minimum payout for Wikinut would be £5.00. For Bukisa, you have to link your account with either Google Adsense or Chitika. Initially, I would suggest Google Adsense but you have to go through the risk of being blocked from the website if they detected fraud clicks activity.
You are not going to earn big bucks overnight with these websites. It is going to take a lot of time and effort to earn money. Just like everything else, you reap what you sow. If you can write more articles, then you are going to earn more money. Have a try at these websites, you might get to have some extra income! Good Luck!