How to add new widget areas

OK, running Simple Catch Pro theme, and need to do some additional customizations but unsure on what is the best way to do so: 1. Need to add a "navigation" widget area below the header + move the navigation to this widget area, so how to add new widget areas and how to then move the menu to this area? 2. Need to add an additional widget area below the main content, again, how to do this? 3. On the homepage, we want to have widgets only (content sliders), how to do this?