re: Do you live in Ireland?
No, I am in London, UK.
There is a mailing list for Co. Down, you may get some help there. You can register here...http://lists.rootsweb.ancestry.com/index/intl/NIR/NIR-DOWN.h...
They may also help you with advice on your research.
The Parish for Newtownards is Newtownards - join Irelandxo they may be able to give you the address of the local Church, and some research advice.http://www.irelandxo.com/where-do-i-start
The volunteer there will be a local who knows the area.
The Public records office for N Ireland is PRONI, you can check what records they keep and what services they offer here...http://www.proni.gov.uk/
Best of luck,