1)hello
A: 안녕(an nyoung) or 안녕하세요(ans nyoung ha se yo)
2)how are you?
A: 잘 지내?(jal ji nae?) or 잘 지내고 계십니까?(jal ji nae go gye sib ni gga?)
3)i am fine
A: 나는 좋아(na nun jo ah) or 나는 잘 지내고 있어?(na nun jal si nae go isseo).
This answer has a lot of meaning in Korean, it depend on the question.
If the question is 'how are you?', this answer is right.
4)thank you
A: 고맙습니다(go mab seum ni da) or 감사합니다(gam sa hab ni da)
5)good bye
A; 안녕(an nyoung) or 안녕히 가세요(an nyoung hi ga sei yo) or 잘가(jal ga)
We have a lot of other traslate. So the answers are one or two of them.
But they are very common answer.