First you have to configure the wireless settings of your router. To do that, it's a good idea to make a temporarily WIRED link between your pc and the router. Once you have that link, you have to read the manual of your router because you have to configure the router not only for the wireless settings, but also for the internet gateway. To access your router, you have to know his ip-address. In your browser you type this ip-address, by instance without the quotes "http://192.168.0.1" and then you will see the welcome-screen or the configuration-screen of your router.
Once the internet-gateway and wireless settings are configured properly, you have to look for configuring you pc-wireless card. Opensuse 10.1 and suse 10.1 have many drivers for many wifi-cards included. If you own an atheros-chip-based card, then you need the madwifi rpm (NOT standard included with (open)suse 10.1, but have a look at
http://www.madwifi.org and
http://madwifi.org/suse ). When you at last don't find an appropriated linux native driver for your wifi card, there is still the possibility to use your windows-driver via the linuxsoft ndiswrapper. Ndiswrapper is standard on the suse 10.1 distribution.
Not so easy for the absolute beginner in linux, but linux-experience is waiting for you and will learn you a lot.
Good luck,
Thomas