Where do I look for them

hi Everyone

I am looking to find my irish ancestors all I have to go on is a letter written many years ago that says ' "fathers brothers went to the school next to the police barrack in the Glen of Aherlow and afterwards to Rosshog" this was written by JOHN MAGUIRE'S [c1840] son. 

The names of this family were

parents BRIDGET BRUTIN she married twice but don't know who was the first husband so the husbands are

HEFFERNAN - their sons are WILLIAM and MICHAEL [ could be spelt HEFFERNON ]

RICHARD McGUIRE also spelt MAGUIRE or M'GUIRE the sons are THOMAS c 1835 my ancestor who was transported to Perth Western Australia in 1858 and convicted in 1856 at the Old Bailey London according to his criminal record he was RC Illiterate and married though the marriage is not proved 

JOHN c1840, emigratedto Victoria and married there in 1860 at age 20 

PATRICK,THOMAS and  RICHARD

any help would be most welcome I LIVE IN HOPE 

Cheers

denis edwards  

sydney australia