Telford/Moore in Cavan

[Chrissy7]

Hi all,
I am tracing my mother-in-laws family who came to Australia from Cavan.
The information I do have is that George Telford (25)married Isabella Moore (18) on 1st December 1857 at Kildallan Church.  George's father was George and Isabella's father was James.
Isabella arrived in Australia in August 1863 with Maryann, Isabella and baby George.  Immigrant list stated that George was already a resident in the Colony.  I can't find George's arrival in Australia or when he may have left Ireland.  I would also love to find out when he was born and if he had any siblings and also anything about Isabella and when she was born and if she had any siblings.
Can anyone help please
Chrissy7