I think the last should be 고마워 (gomaweo), and it means thank you. Please try to avoid romanised Korean as much as possible. Most of the time people choose their own romanised system that simply does not exist!!

Tom wrote the literal meanings for question 1 and 2 and Richardus answered the last :)

jal ji ne go~! (잘지내고... 'and you are fine') a pu ji mal go~! (아프지말고 ... 'and you don't get a sick'... or 'and take good care of yourself') go am weu~! (I don't know this words... is it korean???)

Would you please write them completely in Hangul (한글), I am afraid, I can't understand Latin writing method of Korean language very well. Sorry...