WooCommerce is plugin that adds online shop to your site. It is complete solution to start selling online with WordPress.
To get this plugin and get more info about it follow to https://wordpress.org/plugins/woocommerce/.
In Rife theme we have added support for this plugin so it works well with WooCommerce.
After activation of WooCommerce you should be redirected to its configuration, or if you skipped it for any reason you should see notice in admin area.
All theme setting for WooCommerce you can find in Appearance → Customize → Shop(WooCommerce) settings.
If you need dummy data for your shop then it is in plugin package. In WooCommerce documentation you can find more info about it.