For you promo shop we import al the products via different sources. But its also possible to add products yourself.
If you are just starting out, you can create a few sample products, and experiment with each type. Before you build your actual catalog, make sure to read Navigation by Category and Catalog URL Options. This material will give you a good understanding of the relationship between your store navigation and the categories in your catalog, and how you can help search engines to bring a steady stream of shoppers to your store.
A simple product is a physical item with a single SKU. Simple products have a variety of pricing and of input controls which makes it possible to sell variations of the product. Simple products can be used in association with grouped, bundle, and configurable products.
A configurable product appears to be a single product with lists of options for each variation. However, each option represents a separate, simple product with a distinct SKU, which makes it possible to track inventory for each variation.
The Product Information panel provides access to the full range of settings that make up a product record. The information in this section can be used for reference when creating a product of any type.
The selection of Product Information tabs, and the organisation of the fields on each page is determined by the attribute set that was used to create the product.