Answer:
Use fire proof frame and sheathing material, or use old fireplace. Hook up flue, if one is directed to on the installation instructions, some units require no flue. Hook up gas from 1/2 inch gas supply pipe, a gas shut off is usually already on the new unit. Hook up power if required. Any gas log that is installed after 1991 has to have the mechanical damper disabled or removed according the building code. For home heating sake it is advisable to use a chimney balloon to plug the chimney when the gas log is not being used.