How Do I Allow People To Submit Content To My Site How Do I Create Site For User-posted Content?

How do I create site for user-posted content? - how do i allow people to submit content to my site

I am fanfiction.net when creating a site like, Quizilla and fictionpress.com interested. The problem is that I have no idea where to start.

I was a member of Quizilla.com for two years and decided recently to quit, too. The next reform is not quite my thing, and the stay would be stupid. In any case, make original stories and fanfiction. Many leave Quizilla looking for other sites to their original work published. I really want to make a website.

I wonder how it's done. What kind of code that I do so that users publish their own affairs in a manner similar to web sites that I mentioned? Please give me links that are relevant. I try to make a website, but need to know how to do what I want.