Younger people here (UK) are starting to say "I'm good" when they mean either "I'm well" or "I've had enough of your appalling coffee for one day, thank you." People of my generation think they mean either "I am well behaved, I'm a good person" or are simply throwing the waiter a complete non sequitur. I have a feeling it'll catch on, though.
Strictly speaking Bien is well and Bon is good but the French do not use them in the same way as English so sometimes Bien means good sort of...
Bien here means well, not good. I am well, thank you. If you were wanting to say you were good, i.e. a good person, you would say Je suis bon/bonne, merci.
"I am well fine" is not a correct english sentence. It should be stated: "I am well" or "I am fine." Or even just "fine" But not both well and fine.
How merci actually pronounce? I get it right at third time try, but l said Messi