Help With My GroW!!!

Hows it goin guys,

I'm currently growing a chrystal feminized indica plant and I want to make sure I'm growing it right. I'm a bit concerned since the plant first began to brown out at the tips of some leaves a while back and now its getting some strange brown spots on various parts of the leaves. I've provided some pictures below to help you see the current condition of the plant. The plant is currently in the 12/12 cycle, the lights and the fans are out during the dark period. I'm giving the plant 1/2 strength nutes by fox farms every other day, regular water the next day. The plant is exactly a month old today from the time it was germinated as a seed and I just put it into flowering a couple days back. I'd like to get some opinions on how long until harvest and the approximated harvest yield I should expect from a PC grow such as this one. Also a question about the scrog screen. I have the screen up and the top of the plant is going through the screen, but I don't really know if I'm doing this right since I don't even understand the true purpose of the scrog screen method. Any advice will help out. ThankS.
:weed: :bigjoint:
 

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