I was going to write another post explaining atomizers, but I'm just going to make a suggestion...
Go buy yourself an eLeaf iStick 30 Watt, an Aspire Nautilus, and a 5 pack of Aspire BVC coils for the Nautilus. Get some 6-12 mg/ml juice if you want low nicotine. I'd suggest looking at Halo and Firebrand, both are American made, and Halo offers sample packs.
If you want to spend a little more, get an Aspire Atlantis or a Kanger Subtank (Suggest the new 22mm version.) Get some high VG (50% or more VG) liquid with 3-6 mg/ml nicotine. Firebrand's Sub-Ohm line would work.
If I was starting out today, knowing what I know now, thats what I'd buy. Just my 2 cents, take it for what it's worth.
Firebrand - American Made Liquitine E-Liquid, Sub-OHM Liquid, Premium Electronic Cigarettes
HaloCigs | Premium E-Cigarettes and E-liquid