I totally agree with Asbestos. A common user error for novices is using too high a power setting with a new coil.
Thoroughly "prime" a new coil. It's hard to over-prime it. Take your time and do it right.
With a new coil, "break it in" for the first 1/2 tank full of juice. Do this by using a lower power setting to make sure you don't burn the wick. After the first 1/2 tank full, you can gradually increase the power setting in increments to suit your personal preference. If it starts to taste burnt or too hot, back down the power some. You can use your usual power setting when you refill the tank because the coil has already been primed and broken in..
Some flavors taste better at different power settings. For example, fruit flavors taste better at a lower setting. Other flavors, such as a bakery or tobacco flavor, may taste better at a higher setting. It's pretty much "trial and error" with power settings and different flavors.
Once you burn a wick or coil, its ruined, and may well ruin whatever juice is left in the tank.
