|I take it you have never setup a wireless router or client before?|
You install a wireless router [you will not be using the wan port]
You configure the router with a SSID and wpa2 passphrase
You setup the dhcp scope which in your case would not include a gateway.
On the client you install the wireless card
You setup a new wireless profile with a name like local lan
You enter the SSID and WPA2 passphrase in the profile.
You click connect
You get validated by the router via the passphrase and the router gives the client a ip address. The client is now connected to the lan.
Next step would be to connect to the server.
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