Okay, in consideration of all of the other posts, I know that I am in the minority, but I think it is easier for beginners to learn about all of this using cartomizers. Just be sure to get them fully saturated, on the initial fill especially, and keep them wet to prevent burning. And, if using thicker juices, I would recommend Smok or Kanger cartos over Boges everyday of the week and twice on Sunday. XL cartos would likely be the best choice considering time of use before refilling.
Better to learn the basics of vaping - carto/atty ohms and preferred voltage level, and build a solid base of knowledge to draw on before diving into all of the other stuff. Cartos don't leak, draw is typically pretty consistent, and most importantly they work. Whereas with clearos, cost is higher, quality and effectiveness ranges from great to terrible, draw is too light or too heavy, usefulness varies depending on viscosity of the juice, they leak - not always, but certainly not uncommon, and they can be destroyed by using the wrong juice, leaving you with an expensive puddle of goo.
Sure there may be better devices, some prefer this and hate that, some love that and hate this, but cartos are usually consistent and predictable. Beginners have enough to think about and consider in the changeover from smoking to vaping and staying with the basics makes it an easier process, in my opinion anyway.
My advice for a beginner - a good, dependable VV or VW device (emphasis on dependable), some good cartos, some juice samples from multiple vendors, and find the combo that works for you. When you have that, something you know you can fall back on, then look for ways to improve the vaping experience - it varies from person to person.
Just my two-cents, for what its worth.