opencart Expert Advice - Multi Store - Multi Vendor

I need advice to setup OPENCART multi stores, with find and choose nearest reseller by postcode or map + ability to choose what categories are sold by store and reseller. ===== more details ========== I need advice on how to do the below, opencart can do some of the below, and there are extentions that may do the rest I need a opencart expert to email me the steps for the below and the best extensions to use and what is possible below I am making an opencart site [login to view URL] it sell products for 7 stores, on behalf of many local resellers. A customer can brows products and add to cart across the 7 stores, and choose which reseller the sale is applied to Resellers will not manage there own products ============================= MULTI STORES I want to have about 7 different stores each with a different template and shared cart, that sell different products and categories in each store, some products are shared across different stores. Opencart supports multi stores CHOOSE RE-SELLER I want the customer to chose a reseller/vendor before they can buy products, so sales can be put against a vendor/reseller Resellers do not need to be able to add/manage there own products, It would be good if resellers can see what sales they had It would be good for each reseller to have there own URL to define which reseller is used for the sale like [login to view URL] It would be good to show the reseller logo somewhere ADMINISTRATOR can choose which categories vendors can sell A find your nearest reseller option by post code and choose vendor to checkout with would be good [login to view URL] ===========================