Help with new cabinet set up

Hello everyone! I am new to the forums which i have been reading on a daily basis. I am new to growing! I also have a spot picked out (underneath my lizard aquarium) its already been gutted out and bleached. My question to you is:

1) Do I need cfl lights while using a 150 watt LED panel? LED lights are 3W

2) The cabinet is 8 x 2 x 2, should i get a exhaust fan? If so what size? I was thinking 8" one due to the fact that its not a real big area so i was thinking of putting it in the middle to exhaust both sides ( forgot to mention I am dividing it in half, one side for vegetative and the other for flowering, im aware that i will have to be doing a lot of bending and topping.)

3) im currently using miracle grow (i do not like the soil i am planning on switching when they grow some more) is there a local organic soil i can buy that will not cost an arm and a leg? Max i will spend is 30$. I do not wish to order online... Shipping rates are ridiculous) which soil do you advise me to get?

4) ill be showing the diagram i came up with. (In the picture i have two small oscilating fans hanging and on the bottom is a extra vent area for small computer fans to bring fresh air in) feel free to adjust the picture some! Or any advice is appreciated

Attachment 292462