My organization provides IT services such as email set-up and
maintenance, Networking services, desk-top and laptop maintenance
services, Security services and Anti-Virus services among others. We
are planning to build a Service Catalog for these services. I would
like to know if you could provide the "How to" for building such a
catalog and provide a Table of Contents for such a catalog.

To give you an idea of our scale of operations, we run retail stores
all over the United States of America that are networked and
controlled by central servers located in 3 cities in the US. We
provide helpdesk services through a service desk.

I have seen the ITIL requirements and would like to know if a
step-by-step approach is available for building a service catalog
complying to ITIL requirements.