You can use any third party e-commerce provider or just use PayPal with your e-mail address.
Setup your website.
Upload the ebook to your website.
Setup your unlock software to unlock the eBook or PDF for customers.
These are basics of self-publishing but you will still need to do marketing. I can host a sub-domain for you and setup online activation and deactivation for your ebook in PDF or ebook format. I can also hook you up with an e-commerce provider. I can obtain great search engine results as well if you are hosted at yoursubdomain.zappersoftware.com. You just need to write the book and I will do the rest.