IPF IPF rules for wifi

I am currently running an IPF firewall with a static IP. It has a DMZ on 192.168.2.0/24 and internal LAN on 192.168.1.0/24. Each serve a handful of machines and my Amazon Fire is connected to the LAN.

I have a wireless router and would like to add a wireless route to the firewall like 192.168.3.0/24. First problem is that I am out of ports on my FreeBSD/IPF firewall, so I'd have to plug into the LAN switch. What rules would I need to for adding 192.168.3.0/24 off the LAN, or is that possible? I only want traffic I initiate to go out and everything blocked coming in unless it was from my outbound traffic.
 
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