What do I do?
Off the top of my head:
1. Read the monowall handbook (
http://doc.m0n0.ch/handbook/), particularly section 5 on Firewall rules. The forum is a good resource if you need clarification on specific points.
http://www.grc.com is another good primer on general network security.
2. Make sure all your computers are off or disconnected (turn of monowall) when not using the internet.
3. Ask your son to manage your monowall remotely. He may have to walk you through a few settings to give him access.
4. Find yourself a new wiz.
I hope this helps. Managing a firewall router doesn't have to be terribly complicated, but like anything, there is a time investment to get you started.
db