Log onto your WordPress site and go to WooCommerce > Products > Add Product
Your screen should then look like this:
Enter your Product name and description
If your product description is two sentences or less use the short description instead:
Next go to the Product Data section, it should look like this:
Add your product price in the Regular Price box
On the right-hand side of your screen select your product category and add any product tags
Finally add your Product Image and Product Gallery