modifications on oscommerce shop

Hi we need to make some modifications an integrate a couple of famous contributions, here is the list: >questions and answer above every product >advanced comments that allow to calificate differents product categories like, customer service, easy of use, etc >dropdown categories in all pages except index, show it on mouseover >change width border in each product table on mouseover in product listing >point system for comment, buy, etc, >show differents images on product info on mouseover >adapt page to show correctly ssl certificate(ssl is already installed) >add optional insurance on checkout >add sort by price in product listing >show shopping cart on mouse over You have to have big experience in oscommerce, Our idea is to have a long relation with you if everything goes well, thanks