In order to get started as a Shopify seller you'll need to be able to load your store's inventory and price the products accordingly. As a Shopify seller you can organize your store into multiple collections. Most collections are usually organized by product category but you can organize your store to fit the demands and interests of your audience.
You would need to download the Shopify feed in order to load products into your Shopify store. Once you load the products into the store you can sync your Shopify inventory.