You can't sell without products. From your Shopify admin, go to Products and click Add product.
Enter a product title and description. Your title should be clear and specific. Your description should explain what the product is, why someone would want it, and any important details about size, materials, or use.
Set your price in the Pricing section. Enter the price customers will pay, and optionally add a compare-at price if you're running a sale.
Add product images by clicking Add media. Upload high-quality images that show your product clearly. The first image you upload becomes the main product image customers see.
Set inventory if you're tracking stock. Under the Inventory section, check Track quantity and enter how many units you have available.
Click Save when you're finished. You can always edit product details later.