I dont think you need to have a bridge.
If you have a pfsense box setup and routing traffic on your lan already, then you can plugin your "wireless router" to the switch, turn off dhcp, give it an ip and go.
Otherwise, get wireless card, add it to you pfsense box. add the interface.
https://doc.pfsense.org/smiller/add_wifi_interface/Add_WiFi_Interface.htm