How to set up document for A3 into DL?

Hi all, 

I'm using a template for a document that's A3 into DL and where it says this way facing up and the arrow is down, do I design that part of the doc upside down?

Also if someone could explain how this would be folded that would be very helpful 🙂

Pic attached for reference.

I'm very new to indesign and I would really appreciate the help!! I know it's a very silly question...