Looking for Doolings from Newcastle area, Co. Tipperary

My great-great-grandfather, Michael Dooling (Dowling?) was born on 19 Oct 1837. (I believe to Jacob and Catherine Dooling, baptised on 18 Dec 1837 in Clogheen Parish).

Michael Dooling married Margaret Lockman and emigrated to America around 1858.

I can't locate any information regarding Michael Dooling's parents, nor Margaret Lockman's (b. 1836, Cashel, Ireland) family, except for what I believe to be a record of Michael's baptism. I wish I had known this information before I visited Waterford in 2002, perhaps I could have made the drive during my visit!

I'm not certain about when & where Michael wed Margaret Lockman, nor when either actually emigrated, (together or separately). It's been extremely challenging to find any family information for this time period. My limited knowledge of regional history, despite several conversations during a visit to Waterford have yeilded very limited results.

I do believe that other members of the family emigrated to America, although at different times.

I'd greatly appreciate any assistance!

Thank you, Michael Dooling, Carrollton, Texas