YOU SAID:

Hello my good sir, how are you today?

INTO JAPANESE

こんにちは私の良い先生、お元気ですか?

BACK INTO ENGLISH

Hi are you doing, my good Sir?

INTO JAPANESE

こんにちはをやっている、私の良い先生?

BACK INTO ENGLISH

Hi, my good Sir?

INTO JAPANESE

こんにちは、私の良い先生ですか?

BACK INTO ENGLISH

Hi, my good Sir?