Hi
As for adding product and change in content and description issue is concerned we are sharing a documentation tutorial for your help kindly read it and mange your website woocommerce product according to your requirements.
https://xstore.helpscoutdocs.com/article/29-general-information
There are lot of online help is available how to add woocommerce simple product variable product digital product etc.
https://docs.woocommerce.com/document/managing-products/ https://docs.woocommerce.com/document/variable-product/ https://docs.woocommerce.com/document/digital-downloadable-product-handling/
