directory group website

I am looking to build a directory web site like [login to view URL] I am looking to list business under catagories like type of business and location I want to be able to send the same message to all the businesses in a catagory and manage thier replies like frelancer does treating a question like a project I want a page for businesses in two forms there is the external format where we see business description photo map contact details then there is the internal format where businesses can watch group discussions take place that they subscribe to Based at first on thier business catagory and location (so the plumbers can easily ask other plumbers where they can get somthing and businesses in thier area can discuss local issues like water supplies and word works here in the internal format they can deal with questions easier I would like to be able to incorporate a translation service and a mapping service and streetview would be good too You will need to explain how you will do this project for me in great detail to win it