I am new to this website and currently going for sub 15 on an emulator. How much proof do i need to submit to verify a run?

I suggest you use FCEUX.Remember to read the rules first.

i use nestopia is it fine

Nestopia is ok. It is strongly encouraged to enable frame counter and display of input.

I actually submitted a 14:17 as of yesterday, I couldn't record all the proof that you just mentioned but if it can get verified its good if not I will try better next time.

If the proof is incomplete, you will not be passed when your run exceeds 10:25. We should avoid this situation.

I can use FCEUX for future runs but the game stutters because my laptop isn’t that good.

During the holidays, I will try to find a solution. You can use Nestopia first.