>>15272309write down how much you eat in a day and weigh yourself each week if your standing still or losing weight. you won't gain muscles if your a skelly.
just buy peanutbutter,,milk, eggs and oats. or whatever is cheap in your country. generally better if your weak and skinny then protein powder and more calories/cheaper
if your tall you will need more calories
just slowly increase insensitivity/load each week
read the /fit/ sticker if you really wants to change. it got good information if you have no one to teach you