Greenhouse: How do I prepare the greenhouse for occupancy?, 1 by Padre

Padre wrote:
I hope to move my plants into the greenhouse soon and need advice on how to prepare the building for occupancy. How do I disinfect it? Do I need to remove all the remaining old plant stems (dry and brittle)? There is water and heat. The facility is located on the roof of the biology building and hasn't been used for several years. I have to carry everything the last flight of stairs to the roof. Can someone assist me with a step by step game plan for moving in? Thanks.