Displaying Pages & Posts Together`

Hi guys, I am confused by all of the posts on this topic, so I was hoping for some more targetted advice.
I am in the infancy of designing a site on hungrymusic.wordpress.com and having trouble designing the navigation for it.

So far I have a static landing page to introduce the site. The site itself is split into 3 categories (Artists, Education & Catering). I would like each of these to have their own page, which is as it stands now in a simple site design.

What I would like to so now, is start adding posts to display under the introductory content of each section?
Is this possible, or do I need to make a sticky post with my introductory content and change the navigation to categories instead of pages? The latter seems a messy way to design.

Thanks,
Ben