If you are a moderate smoker and can charge batteries during the day you should be happy with Joye 510 or KR808D-1 as a first ecig
Comparison
http://www.e-cigarette-forum.com/fo...st-electronic-cigarette-first-time-vaper.html
The KR8's battery lasts longer (3-5 hours vs 2-3 for standard 510 batteries, less with heavy vaping). The KR8 is a dedicated 2-piece. 510 is slimmer - almost as slim as a cigarette. There are longer batteries for the 510 called 510 mega batteries - sort of makes an extra long cigarette but lasts as long as the KR8's standard battery
I use both 510 and KR8. 510 comes as a 3-piece but I prefer to use blank cartomizers with it so I can vape longer before I have to add juice.
Whichever you get you will be adding ejuices - the cart of a 3-piece hold enough juice for a few cigarettes worth of drags. A cartomizer of a 2-piece holds 2x of more. But a cartomizer might only last a week before it's not making as much vapor etc. The 510 can be used either way - you could use cartomizers or the atomizer+cart (good to have 1-2 spare atomizers since that is the part that can burn out on a 3-piece)
For either you can get a PCC (a portable charging case that can charge a battery when you are away from AC or computer power and USB charger). The 510 mega xl batteries need the mega PCC.
For heavy smokers, hard draggers, and people who need or want 6-8 hour battery life, get a Joye Ego or Riva 510 instead.