How to configure a PC running pfsense to act as firewall for all network traffic

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 pictur

Question by Vincent Cooke on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.