Websites for Networking Basics?

[struggling]

Hi,
I'm not a novice with PCs, but setting up a wireless home network is driving me nuts. Please can anyone recommend any websites which take newbies through the basics of networking (inc wireless) in a methodical manner?

I have a Trust 485a Speedlink Wireless Web Station (an external ADSL modem/wireless router combi) which has been connected to my main PC (WinXP Pro) by ethernet cable for over a year without problem. It's been excellent. The wireless connection has only been used when my brother calls with his laptop (WinXP Home) - always connects first time and he can use my broadband Internet connection without any problem.
Now my son has acquired a wireless-enabled laptop (WinXP Home) and wants to connect via the wireless router. The laptop shows that it is receiving an excellent signal from the router, but he just can't connect to the Internet. We've tried all the WinXP settings and gone through the home networking wizard without any success.
I'm trying to find out how our network should hang together.
Should the wireless router send an internet connection to any wi-fi PC within range? Should the router only send an internet connection to my main PC, and all other wi-fi PCs access the Internet via a home network centred on that main PC? The router has an in-built firewall - do we need to run other firewalls on each PC? We have ZA running on each PC, but even with ZA switched off the laptop can't connect. I need to know how all this should hang together in order to start making sense of it. I can't understand how my brother's and my son's laptops are so different when it comes to connecting.

Any pointers would be very welcome. Thanks.

[bAdWaYz]

Networking can be a pain but once you get a basic idea of how a network is meant to run it becomes the tech guys best friend. First thing I would do is check out this link HERE After you read a bit then click around and check out other topics on the site. That site has a wealth of info on networking and I like the step by step way they lay things out. Also after reading there you may want to post some more info on what problem you are running into. What kind of notebook this and are you running WEP or WPA from the router. Knowing these things may help better pin point a fix. As far as firewalls go the routers hardware firewall will do just fine no need for ZA at least IMO you can do away with it.