Create an automated online preview of business card orders with information clients type in

I currently have a website that was built and hosted through Yahoo Small business. So whatever is designed/created/built, needs to be able to be incorporated with that. Here's the project: As mentioned, I have a website that was strictly created for this one real estate client. I want to be able to offer them a "live" preview of their order. So, if they order business cards. They will be able to type in their information (name, address, city, state, zip, phone, fax, email, website, etc, etc). Then, I would like them to be able to see what their finished business card would look like with their information. They would then be able to select "approved" or "change" or something like that. If approved, a PDF file would be sent to me for printing. There are currently 3 different business card designs. I also have other "products" that would be nice to have the live preview option and may be added at a later time. For now, this is just for the business cards. I do not know any technical information for Yahoo, so if you have any questions regarding that, I am unable to help. Thanks!