Jason, thank you for your reply. I thought about using the provided sql file, but I don't see how it could help me create my own online shop. I think I need to see my own products to build the shop.
As to database, I still think the terminology is confusing. I do understand the concept of relational data though and its advantages. It is also explained nicely in the book I mentioned about.
I am just off the phone with Apple, and they said FilemakerPro can generate an sql file via export. So maybe that is the solution to my problem. Not cheap though.