First Grow 2400watt HPS, Grapefruit Kush, Soil

Well, I've been reading the forums for quite awhile now and now I figured it's time I ventured out on my own. I was told by the club that Grapefruit Kush was an easier strain to start with, so I went with that, hopefully they are right. I will be using 4x600watt Lumatek HPS for light. I will be using soil in either 3 or 5 gallon pots, and need to decide soon because I just acquired the babies today and need to get them potted asap, so any advice would be great. Also, any advice or questions about my setup or anything else are appreciated. I have attached some photos of what I have so far, let me know what you think, and I take constructive criticism well, so feel free to call me a dumbass, if I am doing something wrong!

I am trying to attach pics, but they don't seem to load. I am going to attempt to attach some pics to this post. I would like anyones opinion on the light green color in the new growth area?