It is commonly believed that if you add too much muscle quickly, you will add fat at the same time. That occurs in the muscle gaining process. It is inevitable and you have to know and agree with that if you want to gain muscle mass. Calories are a must and the more the better if you want to gain bigger muscle mass to your body. For the extra calories, you can’t direct where they go, some of them will go for growing your muscle, some won’t. And the left calories would generate fat.
If you want to make your body shape changes in a short period of time, you should focus on gaining muscle mass in a period of time and then focus on losing additional body fat in another period of time.
In order to slash your extra fat, you have to increase your metabolic rate. Muscle level controls your metabolic rate. So getting muscle mass first is good for dropping your fat. For this reason, build a bulking phase of muscle is a good start.