Creating an Etsy style marketplace for a beginner

I have created a multi site network and I want to make an Etsy style marketplace. I like the demo you have using the global marketplace on my home site, and having the users create their store with the Twenty Twelve theme, simplified like your "Digital Downloads Market".

How do I set up the Frame Market Theme to show my user's product only?

How do I set the twenty twelve theme to only show the user's product and an "about" page?

Thank you.