athenerx,
Take a look at this article:
http://www.practicallynetworked.com/...nux_80211b.htm
Up to a point, wireless setup is the same as wired. You have to run the connection from the modem to the router. After that, instead of NIC's with RJ-45 jacks, you have NIC's with wireless transmitters. They install the same as any PCI or PCMCIA card, but definitely check on compatibility with Linux (brand, model, chipset).
j.