Oh, one last thing: I'd recommend getting at least one simple tank. Like the Kanger Subtank Mini, Aspire Atlantis, or the Smok VCT. They come with pre-built coils that you can just throw in there and vape. They'll tell you what wattage to use for them - e.g. Subtank Mini 0.5 ohm coil might say "15 - 30W". That will ensure you can be vaping within 10 minutes of your mod arriving, with no risk, hassle or worry. Start it at 15W, and increase to taste (but not going much over the maximum they list - a little is usually OK.)
If you get the Subtank Mini it comes with a mini RBA deck so you can also use it as a rebuildable, throwing your own coils in there. The Smok VCT has a separate "DIY head" which is its version of the RBA rebuildable.
The Subtank Mini is a better tank, but the Smok VCT is cheaper (though less so if you also purchase the separate DIY deck.)
Actually in your case I'd definitely recommend the Subtank Mini. It comes with two coils at different ohms - a 0.5 and a 1.2. So you can see the difference immediately. The Smok VCT also comes with two coils, but you'll get either 2 x 0.5 or 2 x 1.2, depending which option you choose, so you won't be able to try different ohms and see the difference.
Also the Smok VCT's cheaper build quality can get a bit annoying - sometimes it gets jammed shut, and it's a lot more likely to leak. So start with the Subtank Mini in my view. (Or the new Subtank Plus looks very nice, taking 7ml of juice and coming with 2 RBA decks instead of one. But it's more expensive, and it's 25mm so it will overhang the mod a bit.)
