Kayfun on an MVP2, I've been trying at 1.6 to 2.0 ohms. Skip to 13 minutes into this video to see the numbers.
https://www.youtube.com/watch?v=xTrQPngaIm8 Phil isn't excited about the MVP2 but I love mine also. In fact, I haven't seen any of the new box mods that is really better for use with a Kayfun at my preferred wattage settings.
I suggest to start to have 28 gauge and 30 gauge wire for your Kayfuns. On a #0 precision screwdriver, 7 wraps of 28g is about 1.1 ohms and 7 wraps of 30 g is about 1.85 ohms. Just add or subtract wraps from those starting points to get close to your desired build. That will get you started and give you a great vaping experience.
Organic cotton works great and is cheap. Your local drug store should have some. I say organic because it's all cotton with no poly filler material. Rayon does wick faster but I don't think it tastes better in my Kayfun. Once you do a few builds, you'll find that the Kayfun is really easy to mount a coil and wick. (I hope

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Problem with most Kayfun clones are restricted juice channels and crappy deck screws compared to the authentic. People blame "Kayfun" for dry hits but it's usually because their clone doesn't have the channels for proper "self wicking" action that a Kayfun operates. I know, I have 1 authentic and 5 clones. Doh!