You're right to start with Amazon. That's where the leverage is. Three tips - 1) put a Lead Magnet (downloadable special report) in the front with link to a landing page to convert them to your email list. They can click through on the "Look Inside." 2) Change the links in the back to your book landing page(s) on the non-Amazon versions. 3) Set up your site to sell versions directly to your subscribers. Probably means building a membership eventually, for special offers.
Glad you found all this useful.