example websites would be hotels.com/care.com etc.
User (Consumer) creates a profile, logs on, searches for a product by location, makes contact with seller, leaves a review if he/she wants.
Registered emails will be collected with Opt-outs.
Contact with seller will be facilitated through the site.
Seller registers, creates a profile, advertises a product/service etc.
Site will have a blog, press page, event notification. usual privacy, disclaimers.
Initial work can be done in a template site (like WIX/Weebly etc) but not necessary.
There will be additional work as prototype evolves.