You can post in the 'Want to Buy' section or search for sellers in the Marketplace. However, make sure to check the legitimacy carefully, as eBay accounts are not cheap. Besides, what issue are you encountering when creating an eBay account yourself? If it's related to device and IP address problems, you can use a combination of an antidetect browser and a proxy to change both the browser fingerprint parameters and IP address
Where I should sent the info needed ?middleman is not a problem.