Okay if you are feeling overwhelmed and you don't know what kind of vaper you will be, something simple like the Eleaf Invoke (it's a small, light, easy to operate mod) with two removable batteries MAY be the way to go. I say that because a) it's inexpensive, solidly built and easy to use. Then you can try a MTL setup on it (more closely mimics smoking, nicotine level anywhere from 12ish to 24ish depending on your smoking habits) the Zenith tank is certainly a good choice.
But, you can also buy a rather sub0hm cloudy tank to try (nic levels there tend to be 3--6 mg juices work best). I don't give sub0hm recommendations, I am not a sub0hm vaper.
If you like one or the other, well if it's the MTL option, you just now have a mod that will give you great battery life. If you find you like blowing great big clouds, well fine, the Invoke with the right batteries will give you that.
Either way you have a backup tank.
it's just a thought, and you need to research your batteries and whatnot but at least you'll have a sense of what you are into.
That's usually my spiel to the terminally confused. IMHO it is the best way to figure out your vaping preference without spending a TON of money, etc.
You can certainly buy a different mod if you wish, the Innoken Proton is rather nice and small in form factor as well;
I do this now after recommending MTL setups to some folks who wound up disliking them so I don't do that anymore, etc.
Anna