Our current integration with WooCommerce is set up so that we only import listings and orders from them, and push quantity to them.
You can't add listings to WooCommerce by clicking the +, like you do with eBay. You would have to create the listings on Woo and then we can import them. We push quantity to them based on the inventory sources you have enabled for them in Channel Integrations, like you do for your eBay or Walmart.
You cannot set up a listing and therefore the price on Listing Mirror. You would have to set this up on your Woocommerce listing, which we import. We only push quantity to them.