Build a discussion forum on my website

Hello, I need to create a discussion forum on my website. My website is [login to view URL] - built on a Wordpress platform. - On my website, we are creating logo designs and graphic design packages for customers. ==> For this task, I need to build a feature where customers: 1) Create an account 2) Can discuss their current project with me (the admin) 3) Can upload files & receive files 4) Have an option to 'Request a revision' and 'Complete project' when they are finished, and I deliver their final product 5) Will receive automated emails when the discussions have been updated - i.e. new responses have been added ** I would like to build a feature that is SIMILAR to Freelancer.com & [login to view URL] where the designer and the customer can have a discussion, upload files, request revisions, complete their work and send and receive files. ==> Here is a SCREENSHOT of the conversation feature on Fiverr: [login to view URL] ==> Here is a SCREENSHOT of the conversation feature on freelancer.com: [login to view URL] NOTE: I am NOT requesting an open forum where everyone can communicate. I am NOT requesting a social network where everyone can communicate. I only want a discussion feature for customers who place an order and can discuss their order with me and send and receive updates. ==> This is not a big project to design an entire website. My website is already built - I only want to add this discussion feature to my wordpress website. Please let me know if you are interested, please send samples if you have samples available. I would like to begin this project asap. THANKS!