Need Help/ Advice

so this is my first grow i went out n got hps 400 watt light on them now i havent givin my plants any nutes yet as the oldest ones 4 weeks i am juss wondering how my plants look to all u vetern growers . some of my bottom leaves have died to why is that..and just wondering how long doest it take to see signs of sex

It looks old enough to give it light nutes. Start out with 1/4 or 1/2 strength, its easier to give it some more than take it away. Less is more!

After it is on 12/12 it will show in a week or two.

so i bought starter kit with nutes gotta lil bit of every thing in its bloom grow magiccal sugardaddy b1 red b1 green ect what would u use for the the stage of growth im in and how much per gallon total newbie sorry guys