Very simply, my fellow human being; open an account for free on hubpages.com and publish unique quality articles. After few articles published and you get a good traffic, apply for google adsense. Google will pay you money. You can also give your tax information to hubpages and they will pay you on paypal.
Other way is to create a blog or buy a domain, write something original and unique, apply for ad sense and get paid. But be careful, adsense don't work with all kinds of free blogs, there is limitation.
The difference between having your own site and working on hubpages is that you have to work extra hard to get free traffic, whereas on hubpages you won't have to work that much.
There are also other ways, but I find it being most simple. Peace!