!st, you're watering them wrong. You water until you start to get a lil run-off, then don't water again until the pots feel light. Try getting a small bag of peat moss, mix with plain perilite then transplant into bigger pots.. Use the peat mix to cover the area where the plants will be...
You don't want to feed unless they need it. That's why there's so many plants burnt up on here and people asking what's wrong.. They will let you know when and what they need.. Loading plants up is the main reason people have to flush.
Not familiar with that brand of nutes, but usually bout a...
Odor control is probably the second most important part of a grow, so you definitely don't want to cut corners. You also need to figure out your ventilation so that you have negative pressure in closet to prevent smells from going into rest of house.
Just hang a blind, then curtain and cover inside with plastic around window frame.. If anyone looks from outside all they see is blind and color of curtain in gaps, no light. I have done it that way for a cpl yrs now and works great.