The question is...will high fat intake give me a pot belly? Or should I just focus on getting as many calories into my system now?
The AIS recommends 1.2-2.0g of protein per kg of bodyweight for putting on muscle.
So as a 73kg guy, you'll want 85-156g protein daily. That's not a heap. Meat is about 1/4 by weight protein, nuts 1/10-2/10 by weight, and so on. So if you have a 220g steak or chicken breast, well that's 55g protein right there by itself. A handful of nuts is going to be 10-20g protein, a glass of milk is 10g, an egg has about 7g, a bowl of oats might be 20-30g protein, and so on. You don't have to be eating an enormous amount to get the recommended protein.
Aside from that, whether your calories come from fat, carbs or protein makes no difference. Just make sure you get enough nutrition (vitamins, minerals, etc) along with those calories. For example, 1,000 kcal of wholegrain bread is better than 1,000 kcal of white bread, and both are better than 1,000 kcal of sugar. That's because one has more genuine nutrition, the other is just pure energy.
Eats LOTS of fresh fruit and vegies, LOTS of nuts and beans, some meat, some fish, and some dairy stuff. To bulk up, eat LOTS of starchy food - spuds, rice, pasta and bread.
As someone who wants to bulk,
if you are ever hungry, you are not eating enough. I'm serious. It really does get to the stage of you sitting there with your fork and a sad look on your face as half the plate is still to be eaten.