For the look your want!
You like the athletic low body fat look or the muscular bulky type ? Nutrition is the key ! Every meal, the amount of protein, carbs and fat will reflect on your look. You are skinny and want to get some muscle, then you need the right mixture of Carbs/Proteins ratio. Weight gainers are the key! Instead, you want to decrease your bodyfat, then a supplement of isolate protein is the key, and at the same time it is important to decrease your carbs intake, both factor in control every meal.