Check out the Autocob (I own six) at
www.cobshop.net. Low electrical draw (only .49 amp), quiet (no fans), small and easy to move, low heat throw, bright as the sun etc etc. 2 will work in a 2x2. I suggest that you go with 1 plant for your first grow. Garner some experience before adding, making changes. Try very hard not to get too handsy with the plant.
I use Phresh carbon filters and Vortex inline fans. Just make sure that the filters cfm matches, or is higher than the inline fan cfm. Open a bottom of wall sock/screen for incoming air. Opposite wall send the ducting out of tent by using top of wall sock, or the ceiling sock if opposite.
Buy a ph device. I am using the Apera PH60 right now.
Buy a usb cam or pocket scope for checking trichomes near end of harvest.
Buy a 6" clip on fan to move air in the tent. Point it to blow over the top of plant. It will help promote stronger stems. I don't use my clip on fans for the first week or two.