The CSS Sculptor Tool will help you to craft new layouts. These layouts can be used as the basis of a new page or template.
CSS Menu Writer will create css driven menus for you that can be used on a stand alone page or in a template.
SiteAssist Pro will create an entire site for you including the template and the menu. You can create a new SiteAssist Pro design based on a CSS Sculptor preset and a CSS Menu Writer menu. Once you have created the design you can then create a new site based on this design. This new site can be edited by hand as if it were a custom created site.
You can also create a template from a CSS Sculptor layout using Dreamweaver's built in template altering abilities. Does this clear up the questions that you have about using these tools to create your templates and designs? If not please post back with any further questions that you have about these tools together or stand alone.