Any HOWTOs for firewalling?

[robin.c.smith@bt.com]

I need to setup a firewall box for my ethernet cable modem. Is there a
checklist or HOWTO I can use to set up the Debian based firewall?

E.g.
1. What is the minimal number of packages I need?
2. How should I setup dhcp ( external to ISP ) and internal to NATed
network?

Any pointers would be appreciated.

Thanks in advance

Robin