I currently do this for my home network. I have a bunch of mixed machines (Windows, BSD, Linux) with a Linux (Slackware) file server.
For my UNIX based boxes, I use NFS to mount the share and access my files. As for Windows though, I have Samba installed. Samba is relatively easy to set up, and if you wanted to make it even easier, you could do the entire configuration via Webmin.
It's been a while since I've used SuSe, but I assume there is a Webmin package out there somewhere. Just install it, and configure Samba that way until your comfortable in tackling it head on.
Visit the links below and let me know if you need any help.
 - http://nfs.sourceforge.net/
 - http://us4.samba.org/samba/
 - http://www.webmin.com/