Dear zudikasgems,
Thankyou for your query. Inorder to start selling on eBay. de you simple need to have a valid selling account which has completed the registration process. You can list directly on any of the global eBay sites using your eBay.com account. You do not need to create a separate account.
Incase you wish to know about the seller registration process please visit the following link:
https://sellglobal.ebay.in/seller-center/start-selling/