So if I'm to get a TFV12 or a smok. How do I work out what power I shouldn't go above. I'm really concerned about blowing my rig. Sorry for all the questions
When using a regulated power device what power you shouldn't go above is determined by the devices low voltage cutoff and the CDR of the batteries you're using in the device.
Mooch explains in simple terms how to calculate regulated device battery amp drain here ---> Calculating battery current draw for a regulated mod | E-Cigarette Forum
Probably best to slow down with chasing high power & bro cloudz until you understand the very basics of vaping safely.