Hi, Jasmine~
First letter
ㄱ=G ㄴ=N ㄷ=D ㄹ=L (The place of tongue is more behind of L) ㅁ=M ㅂ=B ㅅ=S ㅇ=No sound(or 'ng' When it goes under letter) ㅈ=J ㅊ=CH ㅋ=K ㅌ=T ㅍ=P ㅎ=H
ㅏ=ah / ㅑ(=ㅣ+ㅏ= E+AH) / ㅓ=EO / ㅕ=(ㅣ+ㅓ=E+EO=YEO) / ㅗ=OH/ ㅛ=YO /ㅜ=WU /ㅠ=YU / ㅡ= OO (When you pronounce 'good', the 'oo' sound is exactly the same as 'ㅡ' / ㅣ=Y(i)