This is very open ended.

you will need:

Lighting
cooling
heating
dehumidification
a technique to grow and all that encompasses

There is no answer to this really unless we know many things. If you in the desert and its 110 all the time, that changes things.

I think the 1st thing you really need to get is a growers guide.
Bloomin Idiot Reviewed by Bloomin Idiot on . 12x12 room needs help converting to a grow room I have a room in my house that's about 12 feet by 12 feet, on the second floor so it's under the attic,also with two windows in it. I want to turn the room into a grow room. Is it possible? And what materials will I need. No limits on spending, I just need to know what to buy. Thanks. Rating: 5