Fullscreen sections are great for items that need some impact. Do you have a "call to action" that needs to work better, or, perhaps a news item that can't be missed. Well, put these into a fullscreen section and you're ready to go.
It's very easy to set up navigation for a fullscreen website. Give each section a unique name and call that name with a #. You can use icons, buttons, images, and text for these links. Even the main menu is a possible option for triggering the smooth scrolling navigation.