What do you get if you type:
ifconfig
that should show if you wireless card is detected. E.g. mine says:
eth0 Link encap:Ethernet HWaddr 00:1B:24:90:A5:83
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:17
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:2660730 errors:0 dropped:0 overruns:0 frame:0
TX packets:2660730 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:244094922 (232.7 Mb) TX bytes:244094922 (232.7 Mb)
wlan0 Link encap:Ethernet HWaddr 00:1B:77:78:A8

E
inet addr:192.168.0.6 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::21b:77ff:fe78:a8de/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1735835 errors:0 dropped:0 overruns:0 frame:0
TX packets:1944460 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1261351348 (1202.9 Mb) TX bytes:1223427495 (1166.7 Mb)
wmaster0 Link encap:UNSPEC HWaddr 00-1B-77-78-A8-DE-00-00-00-00-00-00-00-00-00-00
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Where wlan0 is my wireless card. If you can see something similar then type:
iwlist wlan0 scan
where wlan0 is the name of your wireless card from ifconfig. If the scan shows your network then that means that the driver is working and finding networks ok. From here you need to either look into getting a wireless gui such as Wicd or networkmanager if your using gnome, otherwise look into using the iwconfig command to connect from a terminal.
Hope this helps!
Jack.