Need help on supplement understanding

I am 50Kg, 6ft heavily underweight guy, I am doing gym but it's useless without protein, finally convinced my mom to allow supplement, I am occassional non veg so protein from there is no go, suggest me good suppliment should I go for weight gainer or protein or something else.

I am on a tight budget so whatever will help me gain weight would be ideal.

PS- I have lots of body heat, ie when I eat eggs and stuff sometimes in summer I get pimples cause of it