You have a choice of .mobi or .epub format. These are the same files which I uploaded to the Amazon and B&N stores. Please ensure file compatibility with your reader before ordering.
If you don't have a Kindle, Nook, or other device like that, you can use Calibre to read either format right on your computer. It's free!
Your order will be delivered as an attachment in a personal e-mail from me. I will reply to the PayPal notification, so please make sure the e-mail address you use with them works and will accept attachments before ordering. Thanks!