I am trying to set up PFsense in my network as a firewall between my modem (ATT modem and my WiFi 6 router). The setup I'm using is a PC with Ubuntu and VMware running PFsense. I have two network connections, one ethernet, and one USB ethernet. How should I configure PFsense to where using the connection coming out of the router and going into PFsense and coming out of PFsense and into the router "Internet" port. I know they have to be configured one "WAN" and the other "LAN", but that is about where my knowledge stops.
I have included a link to my picture of my network setup to help paint a picture.