1) What does the kit include?
2) Do I need to buy anything other than the kit?
3) It mentions atomizers, liquid, etc. Things which I don't really have to worry about with the Magnum since the carts have atomizers in them and you basically just discard them when they're used.
I am interested in buying a COMPLETE kit, meaning, getting something complete that doesn't require me getting anything else except the liquid to refill.
With the kit you will for sure have everything that you *need* to begin vaping. So, technically, no, you don't need to buy anything else.
The 1 atomizer that it comes with will eventually die, I suggest getting a couple of extras (more if you can afford it). They are the Kissbox Classic atomizers.
I also suggest to get some pre-filled carts and liquid (get a high, medium, and low, at least 60ml), blanks aren't too much cheaper, might as well have some ready to go for a couple bucks more. Kissbox Classic Carts hold a LOT of juice, another reason why the pre-filled carts are worth it (at first).
That should last you a few weeks

Let us know how you like it! I won't be buying another PV unless my JS breaks, and when it does I'm getting another...