Here is how your post really reads:
I just bought a new family sedan and really enjoying it. Now I am thinking I would like to get into NASCAR racing. What car should I buy?
Take a long deep breath and get ready for a learning curve. Do ALL the research so nobody gets hurt.
The Kayfun is not a cloud chasing machine, so you will be starting from scratch.
A mech, RDA, multi-meter, batteries, charger, wire, and tools = $$$, even if you buy cheap.
I am no suggesting you don't go this route. It is a lot of fun in the end.
Just go in blindly.
Here is some reading to get you started:
http://www.e-cigarette-forum.com/forum/blogs/state-o-flux/5403-advanced-education-mech-rba-users.html