Sentinel,

Yikes dude... I'm no pro in this weed growing thing, and I'm about to start my first grow now.. but I can tell you, it really depends on what you want to...

You need to hit the FAQs man... read all you can there... for example, if you have big pimping lights, you'll need to provide an exhaust of hot air from the closet. There's shitloads of things... but quite easy once you read a little.

Good luck,

-turtle420