Great workout to gain weight

So as my wife knows I can eat almost anything without gaining weight. Just about ever since I can remember I have just had about anything to eat. Now while girls want to lose weight... Men typically want to gain muscle or in my case, just put on some LBS! I have a buddy that works at GNC and he told me its all about my calorie intake. He told me for as much as I play basketball and workout I would have to consume at least 4500 calories per day and eat my body weight in protein, about 160 grams. So I went to this website and found a lot of tools to track what I eat and workouts I can do.