Baseball Card Website

Hello I am looking to start my own website for baseball cards. It will be kind of set up like a stock market website. The person will sign up to the website ( Name . Phone , Credit card info, ect , ect ) Once they sign up to the site there will be a list of all kinds of baseball cards . They will be able to go down the list and check all the cards they have . This will bring the cards in to there profile and will show them the price of the cards in box and out of the box It will also give them a total on how much all there cards are worth. it will also let them now if there cards went down or up in price.