Here's the User's guide for the router (PDF format)
Here's the link to the quick install guides
The IP address for your router is 192.168.1.1, type that into your browser to access your router. The users guide will tell you how to reset the router to the default configuration so that you can start from scratch with setting up your network.
If you don't need the wireless access point right now, I would disconnect it while you are setting up your network. You can configure it later.
If you run into any snags while doing the setup, just fire off another post
edit>> Almost forgot... If you've been running a software firewall like ZoneAlarm, you should uninstall it while setting up the router and reinstall it later if you want to control outgoing traffic.