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I personally would recommend making a Master Bias of maybe 200 exposures. Takes maybe a minute to get them and having a good bias is great to have for both the flats and lights. Russell is correct that flats are the most important of the calibration frames, this is why I would suggest hitting these with a master bias along with the lights, can remove a fair bit of noise.
You can largely get away without darks by dithering between each frame as Russell suggests. Darks are mostly for removing hot pixels and slow dark current build up, with one 120s subs the build up is not too bad anyway.
It looks like you have some good data there. Realistically, it is going to take you a good year or so to start to get the hang of image processing. I've been slowly muddling my way through it for the last 9ish months and what I have most learned is just how much further I have to go haha
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