describes how to configure your network card using SuSE's configuration utility YaST. There are also links to related topics such as getting your boxes networked and connecting to the net. Give it a try and repost if you run into trouble.
The first thing you'll have to do is make sure your NIC is working. After following the instructions in the link, type ifconfig and see if you get the correct stats for eth0 (your NIC) in the resulting output. If so, try pinging your NIC locally (ping its IP) before even trying to ping the outside world.