To start with I've put capital letters for the proper nouns (names and places) in the first part of your post and then removed the capitals from the rest of it (think you hit the Cap Lock key at that point). I've also broken up your post into paragraphs to make it much easier for us to read.
I don't think you're ready yet to start looking for the family in Ireland. To find Irish connections you'll need to know both the families religion and where they lived (parish if not townland) and you haven't even the county yet.
Best to start with the facts you do have and work from there.
Have you found any of the family in 1911 English census? that one seems more likely to give a more exact birthplace than 'Ireland' or the county. We aren't allowed to ask for 1911 census lookups but there are search hints to help you find the information-
www.rootschat.com/forum/index.php/topic,355239.0.htmlFor Catherine McQuinn- what's her father's occupation on her marriage certificate? do all census records give her birthplace as Scotland? do all census records give her the same approxiamate age?
For Michael Collins- think you've made a mistake with his age- if he was married in 1869 then he's unlikely to have been born 1858.
Meanwhile, I'm going to move this to Beginners board for the time being.