Puff,
Basic dryburning means pull the coil head out of the tank (on a protank just leave the coil itself on the base) and gently pulse it. When it stops vaping the juice it's about as clean as you can get.
With a coil on a silica wick, try not to let the coil glow or heat up much as you dry burn or it will scorch the wick and ruin the flavor permanently.
The airflow is what makes it feel like sucking a golfball through a slurpie straw. Do you have another tank you can try? If not I have a few "starter" rda's that I could send out with instructions and would take even a first-time builder mere moments to set up and will even work with an old-style ego battery.
Any questions just pm me.