Hello, I'm trying to create an HTML5 site from scratch and not sure how to start.

My doubts are:

1- Do I need to create a div to wrap all the site (header, nav, article, nav, etc) or can be done as well without a div to wrap all the site?

2- Now having the new HTML5 tags like header, nav, article, etc, doesn't need to use a div to wrap each tag? let's say a div to wrap the header tag, etc. Or does they work as a div as well as semantic tags?

I have no previous knowledge about web design, I have started learning html5