Build me a minimum viable functioning App

Hi, I need to build a Multi-Sided Platform where my two types of different audiences will interact via "Images" Or "Videos", There should be good interface, I mean the UI/UX design should be very good, and "Sign Up" function, and Image Uploading, Image Watching. In your request, Please, mention that, Which option should I choose between Image and Video sharing? Any Why? I have less Idea, on the Database and algorithm stuffs! Please, Pitch me, if you can do it within 10-12 Days.