To prime a new evod head put a drop of two down the center tube of the head, then put a drop of two on each exposed part of the wick. Then install head into base, fill tank, let sit for a few minutes, then take several primer puffs ( inhales without pressing fire button). You should get a slight hint of the flavor even without pressing the fire button.
The resistance should've printed on the head in small numbers.
Toss the coil in there now, grab the new coil and do this. Most likely all your woes will be behind you.