To add a shop to Influencer you will need the following plugins:
When you install WooCommerce you will be prompted to run a setup wizard. It is important for you to allow the plugin to run this. If it does not install the necessary pages, it sometimes creates a conflict that hides your other post & page content.
You can read more about the specific set up for WooCommerce here.
Once you have your shop installed you can create products by navigating to Products > Add Product