In the internet, there are many sites that are built for one to sell articles online and here are some of them:

CONSTANT CONTENT

It is one of the best one can work with, and here you can sign up as an author and start uploading your writings. This site is very easy to use and you can sell articles, photographs, and videos.

There are three ways of selling articles on this site: (1.) Usage (2.) Unique (3.) Full right

Usage: when someone buys your articles, the buyer can add the article to a newspaper or
a website without doctoring the contents.

Full right: the article will be removed from the site once someone buys it, the buyer has every right on the article, and he can change everything.

Unique: when someone buys your articles, the article will be removed from the site and , the buyer can add the article to a newspaper or
a website.

GURU

This site is a web service for freelancers. Here you can write articles, songs, poetry, etc.
But this service is not completely free.

LULU

This site is an organisation that sells comic books, e-books, etc.
Here a page is created for you were your works are shown. When publishing on this site, the pages must not exceed a minimum of 24pages or a maximum of 800.

Wwaow

This site works just like lulu, but it will not create a page to show your works like lulu. And in order to publish and make the book visible on their database you have to pay for it.