TIERNAN family in Clane ,Kildare.

Hi List,
I am new to this list , & have been researching my husbands family for many years now.
I have recently found a baptism of 2 brothers who came to London & settled there.
On their marriage certs it states fathers name John TIERNAN bootmaker, Kildare.
I think I may have found a marriage of John TIERNAN to Mary MORRIS in Kill, Co KILDARE address was BLACKHALL, DATE 7/10/1834.
I would love to have the entry cert, but how would I go about it?
Which church would it be in Kill?
Is there more than one church ?
Also the baptisms of the 2 brothers was in Clane Parish , is this far from Kill?
Many questions I know, I wonder if I will have many answers.
Any help would be marvellous,thanking you for your time.
Cheers Jackie