You start with a store and then, to keep your products organized within your store, add categories. Your categories will show up in a drop-down list when a customer visits your store. They will be able to narrow their search of your products by selecting a category. You might want to visit other people's stores to get ideas on how to set up your categories. Everyone does it differently so how you organize yours will depend on what works for you and your particular niche.
Next, you can create collections to promote groups of products...either from your own store and/or from any store on Zazzle. For instance if you've created a lot of great tote bags you might want to showcase all of them in one collection. When a customer visits the product page for any one of those tote bags they'll now also see that you have a collection with other designs to choose from.
