Convert webshop and items to OSCommerce

I am an European distributor of an American webshop. All items sold by the American distributor need included in my Webshop. This webshop is already setup and partially configured by myself using OScommerce but can be scrapped if easier. All small and large images and descriptions need to be copied from the US website (about 300), if it cannot be automated, just prepair the shop so I can do this myself. Additional some extra features are needed to be installed for OScommerce: * Automatic a fixed shipping price. * Paypal & bank transfer in advance payment * SEO friendly (all descriptions need to be in the url, no questionmark) * Customer gets an extra item when the referral-code is used * An admin report of all referral customers that paid with order-value * A skinned version (other color and logo and branding-texts, referral code is automatic included) of the exact same webshop using another url. Optional but probably in an extra project: * Translation from English to German/French/Spanish of all items. * Tracking code using google analytics * Any features that improve OScommerce, like let it look less out-of-the box.