INSTALLING MARKETPRESS AND MULTISITES

HI, I WOULD LIKE TO CREATE AN EBAY TYPE COMMUNITY ON WORDPRESS - WE HAVE BUDDYPRESS INSTALLED AND WOULD LIKE IT TO WORK TOGETHER WITH THIS. I READ SOMEWHERE THAT WE REQUIRE A MULTI-SITE SYSTEM WITH MARKETPRESS? THIS WILL ALLOW EACH USER TO BE ABLE TO SUBMIT THEIR PRODUCTS TO THE COMMUNITY STORE… CAN YOU RECOMMEND WHAT PLUGINS WE INSTALL?