Your best bet is to first, study the growlog forum. There's shitloads of opinions on this site, but the best opinions come with instructions and pictures. (a grow log)
Find a grow similar to yours, and see what they did. Any questions after that, give a holler.

The best techniques I've ever seen to get better quality and larger quantity, are knowledge and patience.

Also, 1000w in a closet is going to be pretty tricky. Heat will definatelly be an issue. Just because the spread pattern of a 1000w is approx 4' x 5' or whatever the ad says, this does not really mean it's a good idea to limit the size of the growspace to that dimension. The more cubic feet of growroom airspace, the better.