First up, welcome to the world of modding!
There is no clear advantage to having a mech mod over an variable voltage/wattage device unless you plan on joining the cloud-chasing niche. I don't imagine that happening if you plan on running a kayfun. There is nothing wrong with a Kayfun, it just wasn't designed to do clouds, unless you force it to, and then its structural integrity takes a nose dive.
Unlike most people here on ECF, I do not agree with the Nemesis being a beginner-friendly mod. It needs constantly cleaning, particularly around the switch/lockring area, and is an absolute PITA to take apart and reassemble, compared to something like a 4nine or Vanilla mod. The chances of you taking it apart and it never coming back together again is much higher, due to the number of small parts that are somewhat spring-loaded or friction fit.
Honestly, I think a coil jig is highly unnecessary, unless you have very shaky hands. My hands are pretty shaky, probably because of a serious case of jaundice I had at birth (I'm not a doctor and I'm not sure if that has anything to do with it), and I don't have trouble making straight, neat, contact coils. A properly sized precision screwdriver or drill bit will do just fine. I don't like coil jigs, but who knows, maybe you will.
If you're looking into ease of modding and coil building and wicking and experimentation, an RDA might be better suited to your needs. You would have a lot more space to work with, and more flexibility in the kinds of coils you can build, and the resistance of those coils, without suffering a meltdown. Yes, I have melted a kayfun before. It can happen. The only downside is your constant need to drip and would make it a driving hazard.
Please don't get a trustfire charger. Anything battery related with a name that has fire in it spells bad omen. For some reason, the only batteries I've seen to have exploded were either charging in a charger or were manufactured by a company with a name that has fire in it. The Intellicharger i2 is a great place to start and is fairly inexpensive. It charges properly, and you don't need to monitor it as when it reaches max voltage at 4.2V, it stops charging, and periodically trickle charges to keep it always topped up. I have one, and it's great. A search around the forums should give you a good range of good chargers to choose from.
28g a1 kanthal is a good place to start. I'd tell you to start with 24g personally, but that's because I do a lot of dumb things and end up getting away with it
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Sterile cotton balls are good too. Just remember to wash your hands well before handling them and making wicks, because otherwise they'll taste like ss. If they taste like ss with clean hands, you should try boiling the cotton. I've never had to do it, so if anyone else knows how that goes, feel free to chime in.
As for online sellers, Focalecig and Fasttech have the lowest prices as of right now. Do be wary of the Fasttech, despite they're huge stockroom and enormous selection, 99% of it is atrocious. Make sure you give yourself the time to read all the reviews/discussion about all the variations of the product you want to get so you can make the most informed decision you can.
And in my opinion, going from a nautilus to a kayfun isn't that big of an upgrade. If you went from a nautilus to a Magma RDA, Big Dripper RDTA, or an RSST tank-style atty, it's still cheaper than a kayfun and might be more fun in the long run.
I must be repeating myself endlessly by now, and sorry for the wall of text.
Good luck and let us know what you decide on! Always glad to have another tinkerer in the vape scene
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