I have Cutler-Hammer 200 Amp. Meter box with additional spaces in the bottom portion and I want to run 100 Amp. Service to a building. I am looking for how-to tips and diagrams to accomplish this.

There are many How To books avalaible showing illustrations, descriptions, of the various techniques and materials available, here is one:

Black & Decker The Complete Guide to ... - Google Books

Do some homework and get back with any specific questions you may have.

Also, contact your local building or code enforcement office for their requirements.