Keep in mind, there is no need to do everything.

There are largely 3 separate ways to do e-commerce:

- Shopify (my store, my things)

- Ebay (somebody's store, my things)

- Facebook Marketplace (no store, my things)

These are 3 separate product categories. Mixing these requirementrs in one project won't be good. Just pick what you are solving for and go for it.