Go to Research: eBooks. If you have any currently created, it will list them here.
Hit "Add New eBook" to create a new one. Type the title(1), the intro of the eBook(2), and add a Featured Image(3).
The eBook Fields area is the right column content of the eBook page (this is usually where the form goes). You'll have to create a form and get the shortcode for it, but this is where you would place it(4).
Publish the eBook.
Go to Research: eBooks > Re-Order to do the drag/drop reordering like explained in the above section to switch up the order of the eBooks on the eBooks page.