From page 27 on, it describes how to setup your catalog pages and details pages. I'm using a php dynamic site, but it describes all versions. Once you have those in place, you have to create a cart.php. Once the cart.php is in place, open it in dreamweaver and then you will be able to have the checkout pages created automatically with the checkout wizard. Gotta read it very carefully. I must of did it 10 times till it made sense, but once you do it, it all comes together.
Also make sure you look at the solution recipes included on the page for your download of eCart. I brought them all down for easy viewing.