Feedback: Online Writing Workshop

Hi guys!
For a college assignment I will be developing an online writing platform. But I'm thinking that it has business potential.

The idea is to make a platform where users can write stories and other users can give feedback, which consists in the usual likes and comments, but also a way to highlight a certain part of the text and make a critique for that specific part.

Then stories can be shown sorted by popularity, or filtered by categories, author, etc. Usual stuff.

I thought about Contests too, where the writer with the highest likes on his/her story wins.

Business-wise, I was planning on launching a landing page asap, only to collect emails, while I code the platform during the semester. I also identified plenty of communities who could like the platform on Reddit and Facebook.

That's basically it. Any recommendations? Thank you :)