I work for a Music Marketing company & nightclub

Hello, I work for a Music Marketing company & nightclub i am trying to build a virtual office pretty much, for starters i am trying to make a place where every staff member can login and they will be lead to a dashbored where they can find out promtions, submit promtion materials (Pictures of handing out flyers / online marketing), and then have a overall admin view where the owner can track states can you help me set up my backend?