What's the difference between the first and first?

What is the difference between "first"and "at first" ? As adverbs, the difference is essentially that 'first' relates simply to the order of events (First you do this, and THEN you do that,...) while 'at first' relates to an earlier stage of something as contrasted with some later development,

i hope it helps u :)

tom robinson he was a black man that was accused of raping caucasian woman, and an idealistic lawyer offers to defend him. which makes nobody believe in the innocence of a negro.