A cartotank is a possibility...if aesthetics are important to you (a "smooth" look) the 3.5ml. size would be best...and get a straight sided shorty cone. Most vendors who sell tanks will sell the shorty cones. For cartomizers themselves, for the tank, you'll want the XL size, or 45+mm in length. Single coil Personally, I've had good success with Smoktech cartos, but Ikenvape has a good reputation (if they ever get the right size/ohms in stock again).You'll likely want the cartos made for tanks..they are pre-punched and have a little flange on the bottom to keep them from slipping up in the tank and causing leaks. Generally you want a resistance a bit higher for a VV since you will likely want to "dial up" more than around 3.7volts...so get at least 2.8 ohm and preferably 3 ohm resistance cartomizers. You'll need to get a "drip tip" too..not for dripping, but for a mouthpiece. Get one with a belly type base or wider at the bottom design to help stabilize the tank.
Personally...that's the way I'd go. The tanks hold a lot of juice, and help keep your cartos cooler for longer life (refilling). You'll want to get a couple of boxes of the cartomizers. Remember that a wet carto is a happy carto! Good luck!