@iron2iron People are arguing about whether you should focus on gaining or losing weight. In my experience and personal opinion, it doesn't matter which you do as long as you stick to it for a while. For now, make sure you stay within the recommended weight range for your height. If you can scan body fat, you can also focus on remaining between 10 and 20 percent body fat.
I'd focus on gaining or losing depending on whether you are in the upper or lower range.
Go through longer cycles of slow weight gain or weight loss, even up to half a year in either direction. One proviso is that if you have body dismorphia, you might not be a good judge of what a healthy weight is so stick to the numbers rather than what your subjective self image is telling you.
It will take a few cycles of gaining and losing weight to get a great body. Maybe even just one or two years. All it takes is pairing that with consistent training. Get a good program like the recommended routine and you will be fine.