Welcome, grissto. I'm another who agrees with the advice you've received so far. When you say:
You're mostly right, but there are actually two main styles of vaping. There's DL (Direct Lung), which is inhaling directly into the lungs, and MTL (mouth to lung), which is probably how you smoke - pulling the vapour into the mouth and then inhaling. The catch is that you need different devices to vape DL or MTL. The Smok Nord 4 is more of a DL device, while the Innokin devices recommended above are for MTL.
It's also worth mentioning that DL devices and MTL devices go through juice at different rates, so they're usually used with different nicotine concentrations. With DL you'll generally want around 3 - 6 mg/ml of nicotine. MTL is usually used with 6 - 20 mg/ml juices. You get around the same amount of nicotine either way since the DL devices vaporize more juice per puff. 18 mg/ml juice with the Nord's 0.16 ohm coil is unlikely to be a good experience, but that juice has a much better chance of working well with the Zenith/Zlide's 0.8 or 1.2 ohm coils.
When you get your hardware, you'll notice that recommended wattages are written on the coils (and usually on the boxes). Check the coil before you install it. Then prime the new coil - drip juice on the wick (the white cottony parts you can see through holes in the coil). Install the coil and fill the tank. Let it sit for 5 minutes or so. Finally, start vaping with your wattage set somewhat below the lowest recommended setting. Vape for a bit, then turn up your wattage and vape some more. Keep doing this until the vape starts getting worse rather than better. Then turn it down to wherever you liked it best. That's the right setting for you when using that particular juice with that type of coil.
Best of luck to you, and feel free to ask any other questions you come up with.
