After installing WooCommerce a new menu will be added to your dashboard which is called Products. After adjusting WooCommerce settings, go to this page in your WordPress dashboard and add your first product. To add a product, you can use WooCommerce documentation:Setup Product
When you add a product (If you have not changed the settings) you can see your products in the shop page.
In the image above, it is shown how to get product ID for shortcodes. When you want to set a product as available in single product, you can see it on “In Stock”. The products SKU are shown in the image too. To see shop shortcode use this link: