The two pairs of tender new leaves inside the red box, pluck them out, pinch them off with your fingers.
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Yes, top or FIM right away in, in my opinion.
You
need to top or FIM to subvert the natural
apical dominance, what that means is depending how many time you do it and how long you veg you will get 2, 4, 8, or 24 more big buds, instead of one in the middle. The only situation where you might not want to top is running a SOG sort of set up with lots of small plants. If you're growing just a few and using traditional top-down lighting then definitely always top them, obviously this is "just my opinion." Top and LST, always, or mainline them or something.
She's kind of young to have beat up leaves like I see...What's with the leaf damage and yellow blotches?
Do you think maybe you should be more worried about what's causing that, right now?