With what can I get bigger?

Mass gainer is basically just protein and carbohydrates, and usually it's better to find a cheaper source of both.

Ideally you should have 1g of protein per 1lb of body weight, and you can get that from anything you like, but ideally post workout you'd have a quick protein source, like Whey Protein.

Ideally you would have a shake with 30g of protein, and 60g of a quick carbohydrate, like dextrose, or maltodextrin, as this will maximise recover and muscle growth. If you can't find or afford a quick carb, then just buy a bag of Skittles or gummy bears, something with a lot of simple sugar, and have it with your protein shaek.

Creatine basically allows you to work harder in the gym, and with the right programme and diet will help you bulk up a bit faster. It also makes your skin greasey, so if you are prone to acne it'll cause you problems.

Don't even both with nitric at this stage.

Just ensure your total calorie intake each day (food eaten minus exercise) is around 3000-3500 calories, and has the right amount of protein, and you should build muscle instead of fat.

It depends on your age. 16-22 is high metabolism years and working out wont pay off unless you dedicate most of your time to the gym, drinking protein shakes, and farting while youre not doing the other two.

I would say, to gain serious muscle, not just show off muscle, you should do major muscle groups like:

Chest, quads and hams. You gain weight from working those alot faster than smaller groups.

Also try doing excersises like pull-ups and push-ups, for 2 reasons: 1) not many people can do alot of them cuz they're fat and doing it puts you above average already, 2) you gain leaner, long lasting and real looking muscle.

Fact: the faster you gain a muscle the faster you're gonna lose it. take you time.

I suggest you to eat protein and not take supplements. The protein that you take from food is much better and it gives you much more energy with a healthier way. So try to eat more protein rich foods, like any kind of meat, nuts, tofu, dairy products, etc.