I'm not korean but I'm learning so to introduce yourself, maybe,
안녕하세요!
ahn-yeong-ha-se-yo
Hello
저는 (your name) 입니다.
jeo-neun-(your name)-im-nida
I am (your name).
저는 (jeo-neun) - I am
place에 살아요.
(place) -eh-sa-ra-yo.
I live in (place).
저는 (중국/한국/미국) 사람입니다.
juh-neun (joong-guk / han-guk / mi-guk) sa-ram-im-ni-da
사람 - Person
중국 - China
중국사람 - Chinese person
한국 - Korea
한국사람 - Korean person
미국 - America
미국사람 - American person
(Age)살 여자/남자 입니다.
(Age)sal -yeo-ja / nam-ja- im-ni-da
I am a (AGE) year old female/male.
살 - Years old
여자 - Female
남자 - Male
저는 (학생/회사원/) 입니다.
jeo-neun (hak-saeng / hwe-sa-won) im-ni-da.
I am a (student / office worker).
저는 - I am
학생 - Student
회사원 - Office worker
반갑습니다!
ban-gab-seum-ni-da!
Nice to meet you!
Hopefully i helped and didn't confuse you!! I don't know Chinese so I couldn't answer in Chinese, so Sorry!!