Multi-Site Stores Setup

Hello!

I have access to all of the WPMUDEV Plugins. I am trying to create a website where members will be able to sign up as either a Buyer or Seller.

The Buyer will be the free or default membership and they will have access to comment, and view shops on the network. The seller will be the paid membership and will be able to create their own shops using marketpress.

I am a little confused as to which plugins I am supposed to use to do this. I have MarketPress, Pro Sites, and Membership. Which would I use and is there a guide on how to set this up properly?