The kits above are not bad and they pack a punch as they are "subohm" devices.
If you find them too powerful to start a simple "evod starter kit" may be a good place to start.
Plug and play, if the batts are fully charged and there is juice in the tank and the contacts are clean and dry, they just work. And if it doesn't? probably just needs a new coil.
The kit gives you 2 complete set-ups and spare parts, should be enough for a couple months, other than eliquids. Cheers.