This is my first ever grow so yeah im a rookie but from alot of you guys ive taken the necessary steps for a successful grow. im a lil worried about the next two weeks though. its day 12 of my autoflowering and i know soon i should be adding nutes ive heard a million people say a million different answers. some said i can add nutes next week some said wait atleast a month. ne suggestions ??

this is the run down
soil- ocean forest fox farm
set up- 5 6500k (26 wt) cfls
seed- sour diesel


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by the way can any one tell me why my middle leaves look kind of yellowish should i be worrried?

thanks for the help