I think a lot depends on how your body is hard-wired.........some people thrive on nights, and others are the early-to-bed-early-to-rise types. (I'm in the middle---I hate early mornings with a purple passion, but I was in a continual fog when I worked noc shift; now I work 11A-7P, which is about as perfect as it gets
It also depends somewhat on your age.........young people tend to do better on nights, but once you get past 40 or so, it gets harder and harder to cope with the constant shifting back and forth, which is what most people do so they can at least have a life on their days off.
My recommendation to you is to keep to the same schedule as much as possible, even on your nights off, and avoid napping........too much sleep can make you feel as sluggish as too little. Once your body adjusts to the routine, it should be easier to get the right amount of sleep, and then you can play around with the pattern a little so you can have a normal life when you are off work.
Give it time........three shifts is not long enough to know how well you will do on nights. Good luck to you.