Dear caratsforyou,
Greetings from team eBay!
You are not required to set up any zipcode when you create an eBay store. The zipcode is picked up by the system as per the buyer's address when they are searching for items on eBay.
You need to only make sure that item location & shipping options specified in the listing by you is correct, this will enable your listing to show in the relevant search results.
Regards,
eBay INCBT Team
