How to setup a small office network

Hello,
I am looking to setup a small office network comprising 6 G4 macs (existing computers) that have been upgraded to the newest OS version. What is the best way to go about networking these computers together in terms of being able to share files, internet connection, access to peripherals and also implementing a firewall.
Any suggestions or help would be greatly appreciated.
Thank you

1, Get a cable internet ISP account; depending on your service you should be able to secure a 5Mbps down and 2Mbps up on the cable e.g. Cox or Comcast.
2. Get a good router. The mass market Linksys and Netgear routers aren't very good in terms of reliability. I use a ZyXEL P-330W router is the best I've ever seen. Its reliable and very efficient in terms of throughout. The Apple Airport Extreme is good.
3. Set up the router to support UPnP. This way all computers will be able to share iChatAV video conferencing. If you enabled "port forwarding" only one Mac would be able to use iChatAV video conferencing.
4. Set up your router for DHCP to dynamically issue Internet address to all your computers.
5. Setup the wireless router for encryption such as WPA. This will encrypt wireless communication.
6. Setup the wireless router for only your computers. You'll have to get the MAC/AirPort ID network addresses as expressed in terms of an xx:xx:xx:xx address. You can get this thru your Systems Preferences -> Network window -> AirPort (in the sidebar) -> Advanced button.
7. If you have Ethernet in your office then skip steps 5 and 6 above.
8. On each computer open up the System Preferences -> Sharing and check-off the File Sharing. Set your user access preferences appropriately.
9. Get a Network enabled All-in-one printer and setup Printer Sharing options. Hook-it up to your network and add your printer by clicking on the "+" sign in your "Print and Fax" Preferences.
10. Don't enable Apple Firewall on each Mac. The router will be the Firewall.
Ok. That's the short-hand.. plug it all in and go!

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