A plugin that will make the sorting of the products on the products’ page (i.e. the shop) very flexible. For more information, click here.
To add your own currency or edit an existing one you can use the official tutorial. However, having passed through this a lot, I turned it to a plugin so as to not waste more time in such configurations.
WooCommerce Custom Currencies
For more information, please visit the plugin’s page by clicking here.