Hey there, dhangbgw-gmail-c.
You can select the Nonstore Retailers as the Industry type in QuickBooks Online. Since online retails does not have a physical store where consumers go to buy products but sells them from its website.
I'll be sharing with you this write-up: Your First 15 Minutes with QuickBooks Online. This will help guide you in setting up your QuickBooks Online account as well as a link on how to utilize the software.
I wish you continued success. Let me know if you have any other questions. Have a good one!