The Nolan-Dolan-Glynn family mystery

Location: Ireland and U.S.A.
Surnames/tags: Nolan Dolan Glynn

Ok where shall I begin? Well it depends where you want to start, for me to make it easier Blacklion or Tuam in Cavan Ireland with part of the family tree that traces back through Fermanagh is where I want to learn alot about my Irish family history. One big problem is that my great grandmother Anna Glynn's (Glynn-149) birthplace in Ireland is unknown, I have heard stories that it could be Mayo, my feeling is that could either be Limerick or cork. So far the info I could gather from census records in Ireland is that the majority of my Irish family tree was Roman Catholic and did apparently lots of farming. Also my second great grandmother Susan (Dolan) Nolan (Dolan-423) seems to be a mystery too since I don't know anything about her parents and possible siblings. While trying to find her in Irelands older census records going before the year 1901; I have concluded that she might of been an orphan as a teenager but its uncertain. Also I don't know anything about Anna's parents and possible siblings. Oh the mystery apparently goes deeper with my third great grandparents Peter (Nolan-739) and Mary (Unknown-199835). If anyone can help me learn about my ancient great grandparents Anna, Susan, Peter and Mary then I appreciate it.

Frank John Nolan https://www.wikitree.com/wiki/Nolan-728