When you meet someone you should say these words to greeting them.
안녕하세요 (an-nyeong ha-se-yo) mean Hello
안녕 (an-nyeong) mean Hi
좋은아침이에요 (joe-un a-chim-ie-yo) mean Good morning
잘 자 (jal ja) mean Good night
어떻게 지내세요? (e-otteoh-ge ji-nae-se-yo ) mean How are you?
안녕히 가세요 (an-nyeong-hi ga-se-yo) mean Goodbye (use for people who's leaving and you're stay)
안녕히 계세요 (an-nyeong-hi gye-se-yo) mean Goodbye (use when you leaving and other people is stay)
These questions you can use for start talk conversation with the Korean person .
이름이 뭐예요? (i-re-um-i mwoyeyo) mean What's your name?
제 이름은… (je i-leum-eun) mean My name is .....
반갑습니다 (ban-gap-seub-ni-da) mean Nice to meet you.
어디에서 왔어요? (eo-di-e-seo wass-eo-yo) mean Where are you from?
....에서 왔어요 (e-seo wass-eo-yo) mean I'm from.....
몇 살이에요? (myeot sar-i-e-yo) mean How old are you?
살이에요 (sar-i-e-yo) mean I'm...yaers old.
좋은 하루 보내세요 (joh-eun ha-ru bo-nae-se-yo) mean Have a nice day.
This question asking about what's your occpation.
직업이 어떻게 되십니까? (jik-up-ee uh-tuck-ke dwei-ship-ni-ka) mean What's your occupation?
저는 선생님이에요 (ju-hneun sun-sang-nim e ee yo) mean I'm a teacher.