we should use-' are '

I'm is used when you explain yourself and "I is" was not correct as my behalf.

As Bengali language - "Amar aekta kotha bolar a6e". (I have say something).

I'm so so or you can say I'm well.

The answer was - 'From'

In your question (how many bag do you have) ,there is a mistake and that is the word 'bag'. You should use the word 'bags' in the place of the word 'bag'. By the way, I gave you the translation also in Bengali and Hindi according to your question.