Well i'm fairly new to growing and all but i think I can help you a bit.

That system looks nice, but maybe not big enough. I would recommend making your own, or buying a bigger one as 4 plants in 13"x13" seems extremely crowded. Anyways,

1. If you want to get the best, you should pick up some Mylar sheets. I searched google and found this http://www.hydroponics.net/c/54. It's supposed to be 98% reflective and this is what most people will use when growing.

2. I would keep the growrocks. If youre new to growing I would completely get rid of the aeroponics as I hear it can be hard to grow well. Maybe just get some pots and some good old potting soil and just let them grow. Ive also heard that certain types of growrocks can have acidic pHs, which can also throw you off on everything.

3. I think that should have you covered, a lot better than the 150 included.

4. Do you have a pH and TDS meter cause you will want to keep that nutrient pretty well balanced. At least make sure you can test your pH and keep it pretty neutral. If you try to do it without these your yield might be low or not as high quality. For the nutrients Ive mainly read that General Hydroponics 3 part is the way to go. It has 3 mixes grow, bloom and micro.

I would also recommend maybe an intake/exhaust fan and a fan to circulate the air inside. Also for a lot of information go here http://growfaq.medicalgarden.org/growfaq/

well gl, and hope this helps