1) Yes, the cart object is the Stores Shopping cart.
2) A recordset returns information that is stored in the database. For the rsClassyJewelers recordset to return your product information, you must first enter the data in the products tabel of your database.
You can either do that by manually adding new records to your tabel suing a tool like phpMyDAMIN or SQLYog to access your database, or you could create an administrative back end site to manage your database using DataAssist. see the "How to create an Administrative back-end" tutorial in the How To section of the DataAssist support page:
3) you need to create a master detail page set. The master page is a page that shows all of the products in a list with a link to a detail page. The link to the detail page passes the productID as a querystring variable.
the details page filters the productID column of the product table on the querystring that is passed.
The add to cart button will be placed on the product detail page. by using the recordset bindings, it will get the informant for the correct product.