Seeking Irish roots information

I have always been told that the surname Bryson came to the US from County Antrim.  My direct line ancestor was William Bryson who married Isabella Holmes.  He supposedly migrated with his brothers before the American Revolutionary War.  I have visited Belfast and saw on a map that there are many roads, streets, parks, etc. named Bryson.  It is obviously a common name there.  I am seeking more information about my Bryson heritage.

I also have direct line ancestors named Crawford, Kenney, and Ross.  I am hoping to extend my genealogy research to confirm my many Irish roots and identify more generations.

Thank you,

Nelma Jean Bryson