I'm new to growing under lights. But I'm sick of shelling out loads of money for seedling every spring, and I can so much more variety if I start my own!

So here is my plan, any and all opinions welcome for a newbie. Set up a aprox 3 6ft plastic tables, all pushed together. Several shop lights, with the special aquarium/growing light (saw them at home depot I think). Fashion foil around the sides, and drape clear plastic sheeting over the whole thing to create a more humid environment.

Also, unsure about a couple things. I was planning on buying the bag of organic potting mix they sell at walmart. Is that I should be using, or something with more vermiculite? And I think I read that the light should be apprx 2" above the seedlings?