This question keeps coming up. When you have a coordinate conjunction -- and, but, or, nor -- there is never a single comma by itself after it. You might want to surround something after a coordinate conjunction, but there is not a single comma.
No matter how long the pause after these words nor how much the word is drawn out, there is never a single comma after the conjunction.
NO ...And, so we all left...
NO ...But, then she showed her true character...
NO ...Or, she will have to join in...
...And so we all left...
...But then she showed her true character...
...Or she will have to join in...
...And, by the way, he was not a part of the argument...
...But, like, we didn't want to go...
...Or, Your Honor, we can wait until tomorrow...
Happy punctuating!
Margie