Describe the development plan

Hi I need someone who has skills in analyzing about how to design a database architecture and how a website should be developed to have a effective work flow. I have designed and code the HTML/CSS for a price comparing site. And we need to develop this with the best programming languages, the best database architectur and with the most effective alghoritms to provide the best user experience. Our biggest competitor is www.pricerunner.dk. They have several problems with updating their data correct and in time. Also they have problems to import the data correct from international websites. What we wants is to fetch all relevant data about the products (same products as [login to view URL] we wants in our website) correct and in real time as possible. I wants you to describe how we can develop the database in most effective way and how to develop the website. Also I wants you to describe how we should develop this website, so it can the same things as [login to view URL] - you need to find out where [login to view URL] gets their prices and product information (the data). I need to know your experience and what you can provide here. More information will be provided if needed.