I currently have an ecommerce store built on woocommerce. This was before I onboarded with Odoo. The former ERP I used could connect to the store and sync real time inventory balances as well as orders. 

How do I do the same in Odoo? I use Odoo Online and can't use third party apps. What is the best way to go about it?

Lastly how do I input SKUs in Odoo? I am using Odoo 18