Setting WPA security on an Airport Extreme Card

Hi all I’m a newbie to the wonderful world of MACs having just purchased a dual 2.3 G5 incorporating an Airport Extreme card.
Now, in my simplistic world I figured that I could use the G5 connected to the internet via an ethernet router to act as a base station and allow 2 PC laptops to have wireless internet access too. Also, it would be good to allow these laptops to share the printer connected to the G5 and, absolutely ideally, share files too.
The internet sharing part of this all this works fine up to a point – that point being until I try to secure the wireless network! I’ve tried using the WEP solution (in both 64 and 128 bit modes) but the laptops just won’t connect, even though they can both actually see the network. I also understand that WPA is more secure than WEP anyway so I thought I might try that instead. Trouble is, I can't find where I can set this up for the AE Card.
So basically – could anyone tell me, in simple terms, whether I can use just an Airport Extreme CARD (rather than a full Base Station) to give me WPA security in the setup that I’m trying to create?
It seems that the card itself DOES support WPA if it’s connecting to an already-enabled network, but all I can find in the configuration options for the card is the WEP security (which I can’t get to work AT ALL!) I tried using the Airport Admin Utility to set WPA-Personal mode (which I understand is equivalent to WPA-PSK mode?) but that only seems to be for the Base Station.
I have spent the last 2 days trawling through as much information as I can find (including on these discussion pages) and still cannot find an answer.
If anyone’s still reading this rather long post and could offer any help at all, I’d be very grateful indeed.
Many thanks in advance,
Andy
PS I LOVE the MAC!!!

I need to set the network id to 10.10.1.1 will a new airport extreme do this?
Sorry, but no.
The AirPort can only be set to 10.0.x.x, 192.168.x.x or 172.16.x.x

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