WebGIS enables powerful geospatial web applications and services that securely share your organization’s rich geospatial data, and provides tools to deeply examine spatial data and create value added products, on demand.
The attached PDF file provides a description and step-by-step guide for creating a single WMS Service. A single WMS service is comprised of a WMS Service Source and a WMS Instance where the Service Source is associated with the instance.
There is also a tutorial provided in the online documentation entitled "How to Create and Copnfigure WMS" which also walks a user through the steps of creating a WMS Service Source and a WMS Instance for a WMS service. The online documentation link is: