first thing id do if i was you is change the tinfoil to flat white paint, its a better reflector. hard to see the plants. might want to add some more light for 9 plants. its ok when they are little but they starve as they get bigger. as far as flowering goes, you may want to give it a nother week or so depending on tall they are and how many nodes they have. if height is going to be an issue sooner than later is what you need. if height isnt a big deal...and when isnt it indoors, but then you could give it another month if you wanted. depends on what strain it is also. dead and withered leaves well is best not to have them obviously. if they are dead cut them off, if they withered you need to find out why they withered if we are talking about a bunch as opposed to one or 2.
thats whered id start anyway, i imagine others here will have some advice for ya too.