If you want to create a website, you need to use the Pages application. There is an icon on the home tab.
But pages need templates to define how they are displayed. So the first thing you need to do is installing a template. They are created by designers and developers.
If you just installed Novius OS, you can install a default template from the application manager:
You can access it from the home tab (see above).
The Visualise action allows you to preview the page, even when it’s not published yet.
When you’re happy with the content, you can publish the page and save it.
Have a look at the wonderful work you’ve just done: