Amazon & eBay FBA Setup

I already have active seller accounts on both Amazon and eBay, but I have not linked either marketplace to Fulfillment by Amazon yet. I need someone who can walk me through—or, if faster, jump in and complete—the... (Budget: $10 - $30 USD, Jobs: Amazon, Amazon FBA, Amazon Web Services, eBay, eCommerce, Inventory Management, Magento, PHP)