Like "Wyandotte" I'm not sure what you are asking so from the standpoint of a repeater you would need to apply for a repeater frequency pair from the appropriate coordinator and file for an FCC license. You will need the coordinates of the repeater, transmitter power, number of radios, height of antenna, ERP of the repeater and a number of other technical information parameters. This is assuming you have a place to install the antenna at the "station. It might also be good to run a coverage test (either actual or on paper) to determine if the station location will cover the intended area. Then comes the actual equipment list of all the components that are needed including the antenna, coax, and hardware as well as NEC grounding requirements. Depending on the height and type of the support structure (building or tower) you may need local, state, or even national permission. If you are thinking of a "do-it-yourself" install you will need some test equipment to setup the repeater and duplexer (and someone who knows how to use it). Don't forget the re-programming of ALL the units that will be using the new repeater frequency.
These are just a few of the things to consider.
BB