How to set up wi-fi device?

[Jonathan Melhuish]

I seem to have successfully installed my BT Voyager 1010 USB Wifi 
adapter.  The driver loads upon plugging it in, the "activity" light 
switches on, and all is rosy.  But I'm slightly at a loss as to how to 
proceed.  The README that comes with the driver slightly tersely 
suggests typing something along the lines of:

iwconfig wlan0 channel 3 mode ad-hoc essid fred
ifconfig wlan0 192.168.0.1
Which I've tried, but don't seem to have acheived anything (I assume 
wlan0 is an abitary name?).  All it seems to have done is break the 
hostname lookups on my wired connection, eth0.  Which is damned 
annoying, as without the web I find it very difficult to fix anything :-(

Can anybody point me in the right direction?  Are there any packages I 
need to install?  Do I need to add anything to any config files or 
something?  Can anyone share how they set up their card?

TIA,

Jon

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