To build my grow room I went through extensive research. At first I only grew one plant to make sure that I had the knowledge to do it then I built the grow room. While it is not that size you have to take into account how much time you will be able to offer. Also, I would have to know location (not exact, but state to determine average temperature and humidity). Also, you would have to decide what type of lights you want to run and how many. You would also have to take into account the ventilation, smell, energy consumption, and many other factors. The best bet is research, research, research. Before you decide to build a room make sure you have the plans written down. As for the fans and lighting, this is a great site to research, but for the entire room it is dependent on how much you really want to put into it. My finished room cost a total of around 3000 and it is only 15' by 8' and is split into a veg and flower room. There are way to many variables to answer this question. Stick to specifics.