I'll give it a shot! :) But I will not write out the romanized versions. It takes too much time. And if you really are interested in learning Korean, I would recommend to before anything, learn how to read 한글! Although, if you really want the romanized versions from these, just copy and paste them into the Korean section of Google Translate and there will be a sort of romanized version at the bottom.
1. "배고파요." = "Hungry."
This comes from noun 배 (stomach) and verb 고프다 (be hungry)
2. "만나서 반갑습니다." = "Nice to meet you."
This is a standard phrase.
3. "그들은 돌아올 거예요! 준비해요!" = "They are coming back! Be ready!"
Not sure about this one. Especially how to express "Be ready!"
4. "아, 머리가 아파요." = "Ah, my head hurts."
5. "레이디스 코드가 컴백해서 저는 너무 흥분해요." "I'm so excited because Ladies code will be having a comeback."
I'm not sure about this one. I would probably get a native Korean's opinion if I were you. :)