Well, you won't need but maybe 2 600W MH, and you should be able to have the other 10 600W HPS for flowering. When plants are vegging, you won't need as much space. Your veg room should be about 1/4 the size of your flowering room. I would suggest you start off a lot smaller to begin if you've never done this before. 12 600w lights going at the same time will throw off 24,000 BTUs of heat. If you have a 10K BTU a/c, it is gonna be pretty toasty in there on a hot summer day. In other words it will take 24,000 BTU air conditioner to keep the same temperature inside your grow room as it is in the rest of the basement.
I really feel you need to get your feet wet before you get into this. What are you gonna do with 100 seeds? There's no way I would start off with that many! I'd start off with a little light and max 20 seeds, let them grow and find out which ones are male and female. Then cull the males and make clones of the females.
You're going way too fast.

SN