Great choice. This is just my 2 cents of course...
Until you know for sure this is for you, I think you'll be good on batteries (3) and atomizers (2) for a while. Atomizers I feel last longer than most people say they do. That being said though, I now like to have 4 atomizers going all the time, each with its own flavored juice. Speaking of juice, I initially ordered a whole bunch or pre-filled carts that now sit around never to be used. I found out really quick that I much preferred blank carts, replacing the filler with blue foam and filling my own. Its cheaper and gets me the flavors I want - and not nearly as intimidating as i thought it would be. If you go with pre-filled carts though, you might want to assume going through at least 2 a day. In case you want to fill your own, buy 1 box of blank carts. These 5 carts will last you a long time if you wash out and replace the filler once in a while. If you go this route, obviously buy some juice too. To begin with, figure at least 5ml of juice per week. The last thing I would suggest is an additional charger, one that will charge an individual battery should you're PPC die at an inconvenient time. If you're near a computer often with a USB connection, get the USB charger, if you're not, get the wall charger.
So here's what my initial minimum laundry list would be...
-The Kit
-1 pack of blank carts
-4 5ml bottles of different flavored juice
-A/C Battery Wall Charger (unless you'd prefer USB)
If you like it, maybe then order a couple more atomizers and look into replacing the cart filler with blue foam found at your local pet store that looks like this....
Marineland Magnum Foam Sleeve "Rite-Size U" 3pk.
GOOD LUCK!!