Reply To: Completely lost

Hello,

Yes you need to use WooCommerce for this. Because WooCommerce is used to add store functionality to a website.

First you need to make sure that you have installed and activated WooCommerce.

Then To add a product you need to Go to Dashboard >> Products >> Add new product.

Screenshot for Clarification: https://ibb.co/ZNnz9kS

OR

You can read the following article for further help.

https://docs.woocommerce.com/document/managing-products/

Best Regards.