I'm afraid I'm quite new to GeoServer and I have been set the task of configuring ArcMap applications to display data from PostGIS/GeoServer. I realize that I will need to set up a WMS service in GeoServer but I'm not really sure how one goes about doing this.
If any one can give me some pointers or step by step guide it would be much appreciated. I have tried Googling it but haven't had much luck.

