What do i need in order to get abs?

Hello. I am not fat but a little skin in bones. I wanted to get some abs but don't really know what to eat as a diet. If u can, tell me what should i eat for breakfast, lunch, and dinner, +2 small snacks. Btw, in lunch there is litterally nothing healthy. Pizza, Nachos, Hotdogs, etc. I was planning to go and buy a bagel which is cheaper in breakfast than lunch. Is a normal plain white bagel good? Is eating chef boiardi ravioli good for you? i am starting to eat go lean crunch for breakfast. and also idk what good thing to eat for dinner