and wireless network cards in each computer you have all the hardware you need.
You'll need to connect the router to your ADSL phone line, and then temporarily connect the router to one of the computers using the lead that comes supplied with the router. This is so you can update the router's firmware with details of your username and password. This information is downloaded to the router so it can automatically establish the broadband connection each time it's booted.
Once you've completed the set-up you can disconnect the lead that connects to the computer.