1st two separate pumps. 1 for the air and 1 submergable pumps.
2nd i used the general hydrponics feeding chart on my last grow and followed the measurements.
3rd the fogger floats.
4th yes the HD pump is for the drippers.
5th yes you can grow all the way through with the 3 inch net pots, did you see the pics on my Big Bud grow , it was in the 3 inch pots.
6th i kept my drip on continiously , just dont let it drip right on the plants , aim it to the side of the plants.

hope that helped, if not holla.