Once your seeds have sprouted a tap root place the tap root pointing down into the rockwool(I would recomend grow plugs instead).Make sure your rockwool has been soaked in ph adjusted water, I just use it straight from the tap and adjust. Look into buying a germinating dome this will keep your humidity high. As soon as they have popped up out of the rockwool when you see those 2 little round leaves, keep a light on it 18/6. Those 2 little round leaves provide all the nutrients the plant needs for the first month or so. when you have 3 or 4 setts of real leaves and roots coming out of the bottom then your ready to add your nutrients.

Oh yeah make sure the seeds in the bag are in a warm dark place.