So I use Convertkit for the email list and sequence.
I built my site with Thrive Themes so I can have the forms and connect the API through the page builder.
I used to use WooCommerce (free Wordpress plugin) to host my books — it acted as the storefront.
Now, I use ThriveCart (not associated with Thrive Themes) because there is WAY more functionality.
You can find how to build sequences with walkthroughs on CK and ThriveThemes is amazing because they provide already prebuilt landing pages (you just have to fill in the detail with your own information).
The ebook is created on GoogleSlides (free).
I hope this helps.