Just ready to start flowering stage, past week a few leaves are turning yellow. I’m using grow kit from ilgm for nutrients. Adding photos
looks like normal aging of the fan leaves. wouldn’t worry about it. tuck them down so they don’t block bud sites
Those are about halfway (or better?) through flower.
I wouldn’t worry about losing older leaves at this point. As the plant gets closer to harvest, you’ll lose more. At this time you can remove them. When you stop feeding your plant, I’d stop removing them.
Thats not normal.
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Check for pests. What are you feeding them? I am no expert but it looks like a deficiency of some sort.
It’s a little curious that the damage seems to be on a single branch 
making me think it’s bugs
U could give it some potassium and phosphorus
