The technique I use to pronounce Portuguese words or parts of words is to select an Englsh word with a similar sound and modify the English sound as necessary. For "pão" I se!ect "song", substitute a " p" for the "s" and go light on the "n" and the "g". The feedback I get from native speakers is a passing grade. I believe the technique should work for any combination of languages. I am a native English speaker.

why do you use como instead of come

Porque não: o pão?

One ideia for pronunciation on (it is the same of song). It's speak for nose, Brazilian say for little child : O som é o mesmo de quando você tampa o nariz