Which plugin will i be needing(Marketpress or buddypress or membership)

hello To WPMUDEV Team,

I first wrote a message on facebook and I was told to write a Message to the support Team,I wrote two emails no respond and I also called no respond.

I will be happy if you could assist me,I working on a project(its like a social media website and at thesame time a market place . In short its a combination of soundcloud and ebay or etsy)

I watch the video online but I got stuck because I new knew which plugin to use to complete this task.

I already have the domain name(myshekere) and hosting and have already set the website to a multisite.

I will be happy to get your assistance and accept warming greeting from Germany