Computer-Telescope Interfaces require two components. The second is a pair of encoders that are mounted on the telescope. The encoders have one job - tell the computer how far the telescope has moved. The system requires a pair of encoders as telescope mounts allow motion in two different directions. Once mounted, the equipment will allow your telescope to talk to sky plotting software on your computer.
Sky plotting, or planetarium style, software is available from many sources.
Some of those that support CTI interfaces even have versions available for downloading off of the Internet. Many of these can be found on the Planetarium's web site under the Astro Links button and Software. CTI technology is indeed magical. It will allow you to enjoy and share the nighttime sky while your confidence and ability to find objects in the sky without the system improves. Ultimately, you'll spend more time enjoying viewing the nighttime sky rather than searching for its contents.