John Flanagan

I am trying to find inromation on John Flanagan and all the variables of his last name.  He was born 1832 in County Tipperary and arrived in Australia 1856 and married in Australia. His parents were Michael Flanagan and Elizabeth Costello.  I have searched NLI and all the usual places and have not been able to find any information on his parents or his actual birth place or date.  Thank you.  Gale