Need Customized Magento Application For Existing Site

We want to expand our current eCommerce application built on magento . Features we want to add are mentioned below. a. We need one search page just like google. b. When someone search anything from it it will display search result fetching information from other website we mention on backend . c. When we click on the search result it will show all the information of the product. d. When someone buy the product we need the purchase to be completed on our platform. e. When visitor has opened the search result the price should be in IP currency , It will show a margin money which we are going to add on backend , and it should display the calculated shipping price. f. We Need a option to add and remove website on backend . g. All purchase are done through our payment gateway. h. As soon buyer placed an order we get a mail with the following link of the item. i. All Page Results should be neat and clean j. search result page should have sorting options . Please share us your idea so we can continue .