Build an Online Store

1) I want to setup an eBay like auction site with "buy now" option also. 2) Need to upload all the categories and subcategories from eBay (there are thousands of them). 3) Should be easy to update categories/subcategories in the future through CSV or XLS file. Category update should be easy. 4) I should be able to add "custom fields" through admin panel or CSV file. Then in the related Categories those "fields" should be visible. 5) There must be a "Detailed Search" function. Related "custom fields" should show up in detailed search box in related categories. 6) Paypal, 2co and payza, voguepay, simplepay4u, payfas gateway integration. 7) Facebook login option. 8) Should be mobile friendly website. 9) Design should be modern and attractive. Like this for example: [login to view URL] 10) Product sort option from high2low or low2high according to price, date.