Very First Grow - I’m all In!

Confused on whether the first week is of seed germ or when it sprout so went with this as week 2. Since they all germinated I was kind of in a spot. Let them go or grow all. So after days of obsessive research I decided that just a single grow area wouldn’t do and decided that I’d in growing 9 plants at the same time, im gonna need more room and more light. So I built a space in my basement with reflective Mylar, exhaust fan, lighting (2 400w lights) and de-humid and humidifiers.