ventilation? yes? no?

hello! I am a newbie here. I just bought all kinds of stuff for a closet grow and apparently you have to have ventilation for your plants to grow. I keep seeing forums that say ventilation is so important and this and that. I am using CFL bulbs and only planting three plants, is it really that important? If so I am thinking about putting up panda plastic in a good size section of my closet, so I can create ventilation on it. is this necessary? if so, where do I put the intake and exhaust? what do I use to ventilate?? how do I apply it to the panda plastic? I need answers! Thanks forum.

An exhaust fan with a charcoal filter would be good idea. Take the exhaust from the top of the space.

ok thanks that is what I am planning on doing now that I have done some more research.. do i need to put an intake fan at the bottom of the grow tent so air can go in the tent or do I just put a hole or two at the bottom?