Checkout > Products
The product are the mainstay of your shopfront or store. Products can be Tangible or Digital i.e. a physical product or a song, picture, PDF etc that a shopper can download after they have paid for it.
Products can be just about anything and varying in types, shapes styles etc. Each product can be uniquely define using the Variations options and can also have unique custom fields created for it that the user must will in before checking out.
You will need to work in reverse order so remember to do your configuration under Checkout > Configuration then set up your Product Categories, Product variations, Suppliers and Custom Fields before you start adding your products. It is also a good idea to have you images ready if you are going to use product images.
Start by adding a product.