Add shopping cart software to website

Need to set up an online store to sell transcripts in PDF form. Will be using [login to view URL] software. I already have a blog up and running. I would like to keep the current design and just tweak it a little to make the home page prominently feature the addition of the online store. Blog is currently running WP 2.5.1, so that will also need to be updated to the latest version of WordPress 2.6.2 just to make everything uniform. If you bid, please provide a link to samples of your past work and tell me if you have any experience installing e-commerce software such as 1ShoppingCart.