I am assuming you have ADSL? not cable?
You're going to need a wireless ADSL router, and cards, my personal choice these days is netgear stuff, I've used D-Link before, and are as good, but the setup/config is a bit more fiddly.
Firstly though you would need to connect either machine directly to the router to configure it, such things as your ADSL username/password, and port forwarding, firewall etc, and also tie down the MAC addresses of the wireless cards, possibly wireless encryption also,so only you can access your network.
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