I have a similar setup. I have a 7x7 grow room in the basement. I insulated the ceiling with r19 and the walls with r7 closed cell Styrofoam (the pink stuff). The room is completely sealed. I'm running dual 400/600 watt lights that are cooled with a 440cfm fan. Inlet and exhaust from outside. My ballasts (and reservoir) are outside the room. 18 hour cycles will get temps inside between 82-84. Which is perfect for me as I am running co2. If my ballasts were inside, it would be at least 10 hotter. I would HIGHLY suggest you run air cooled hoods. That way you can get the light closer to the plants without scorching. infrared heat gun readings on my light bulb can get in excess of 170 degrees!!
A slick way to do it is time the lights to come on without the fan for about 30 minutes or so to get temps where you want them, then have the hood fan turn on. (word to the wise, make sure your hood fan shuts off at exactly the same time or slightly before your light does. If not, when your light shuts off the RAPIDLY cooling aluminum ducting will condensate like a muther fucker--and nobody likes rain indoors). Insulate the room to moderate temps, big swings in night/day temps are not good for the plants and makes it easier to control the temps of the room. In the summer when the lghts are not as effectively cooled with the outside air I do have a cheap 4" inline fan mounted up high that exhausts the internal hot air and lets cool air in the room from a passive intake down low. These are sealed for most of the year as I run co2 and I cringe at thee thought of spider mites or molds making there way into my room. Humidity is controlled by a de-humidifier that runs when the lights are off.
I have a small carbon scrubber that runs 24/7during flowering. You need a decent fan to pull air through your carbon filter. 80cfm not going to cut it. You need to completely scrub all the air in 5 minutes. A good carbon filter will be densely filled with carbon and slow the fan down allot.
Lastly, Your going to want to have a metric shit load of fans to blow on, near, on top, below your plants. It enables you to keep the lights closer, reduce the chance of molds, increases gas exchange across the leaf surface, and most importantly, the swaying of the plants damages the cell walls of the stems and they heal themselves..thus making them stronger. just like in nature. I also put a wet towel in front of the fan when I want to jack up humidity rates.
That's my advice for what it is worth. I don't know anything about any of this stuff either so maybe just rig some half ass system, save $200 and struggle.