Accounting for ecommerce sellers

Hi,  I am a new amazon seller. I am trying to maintain accounting on my own. Whenever a sale is made, we ship the product to customer. The invoice is generated from the amazon site on the specified date on the name of customer. So, how can I record this entry? Opening an entry on every customer name or can I simply make it in name of Amzon?  Please, explain it in simple terms. I don't know much about accounting. It will be a great help.