Construisez un site Web

I need a market place like: inspired by Etsy or Houzz For 500 professional users (vendors) to sell their items. Each vendor regiser and access is own control panel .Vendors back office (Complete statistics vendor activity. as complete as possible with infographics) Customers to vendors When a customer buy==> create a customer account. Web site back office:: complete statistics. fees sales number ofcustomers, vendors etc... Customers and vendors account linked to Twitter facebook instagram.. Private: Vendors forum Private communication : site to vendors. Site to customers + Blogs I need an real -estimate. Low price -high price and how will it take to built it. I need those numbers for my investors and If ok I need a reliable team -web developer designer ... to built it and take care of it. (please show me what you have done before..will be great too) Thanks a lot Mat