How could I integrate Marketpress into my site?

Hi

I’d like to create a network of stores on my website, url is http://www.greenwichmums.com whereby our users can create their own store for a monthly fee.

The site is powered by Genesis and is already running Buddypress, Classifieds, bbPress & a Jobs Board widget (WPJobsBoard).

How could I go about including a virtual marketplace though? Would I need the pro-sites plugin aswell?

Thanks!

James.