The atomizer/cartridge setup is what a lot of people start with; most eventually move on. You can try some cartomizers right away, but don't sweat about it too much. An atty & cartridge WILL work just fine. Here's my suggestion for starting out:
On top of your basic kit, get at least 30ml of juice. 5 pre-filled cartridges (carts) won't last you too long. I quit a 1.5 PAD (packs a day) habit, and 5 carts would last me a day. I suggest small amounts of various flavors, so you'll have an idea of what to get NEXT time.
If you smoke half a pack or less a day, no problem. More than that, and I highly, HIGHLY suggest extra batteries and/or a PCC.
Lastly, and I don't think anyone has mentioned this, a word about atomizers. Your atomizers come from the factory with a light coating of oil on the coil. You can vape right through this, but it tastes pretty foul. When new, put a paper towel over the threaded end, put your lips on the other, and blow hard until the liquid stops coming out. That will minimize the ickiness of the first few drags. Also, a new atomizer comes with an empty cart attached, one that has no stuffing in it. This is just to protect the bridge in shipping, but you CAN use it as a mouthpiece if you want to try "dripping" (about 3 drops of liquid directly into the atomizer, lasts for 7-8 good drags, no "stuffing" over-taste).