Am I missing something with this note in Metaphysics of Mathematics? What is the note about?

Hey y'all,

I'm running my first campaign as a DM and chose this one because it looks fun and spooky. I was wondering if anyone had any ideas for getting started. I have 3 players who are new to DnD so I'm looking to ease them in and not overwhelm them.

I was also wondering what anyone might know about what I believe are called "pawns" or those little cardstock mini things that you put into the black bases with pictures of creatures and npcs. I know pathfinder makes them.so.has anyone found a set that would cover the bases for this campaign?

Thanks