Jasmine,

Welcome to the power meter world When you first start using power the first thing you will notice is that the numbers appear to jump all over, that is one of the differences if you compare it to a device that measures heart rate. Power is shown instantaneously and HR takes some time to reflect any changes in speed, grade and wind. It takes sometime to get used to how quick power changes and how fast is affected by anything you or the terrain do.

I wouldn't go into to much detail but my recommendation is for you to give it sometime, ride without really trying to stay on any given zone, just ride, see the numbers and you'll start to see a pattern.

To start understanding how power works, find a hill that is not to steep and has a good steady grade, ride it at zone 3 or pick a number of watts (zone 2 maybe to hard to do on a hill depending on you fitness level), the number will go up or will fall almost immediately when you pedal faster or slower but try stay close to the zone, at the end you should get an average for the climb that will be close to the zone you are trying to do. Cheers

Deya