You haven't said exactly what sort of information you are hoping to find so difficult to give more precise help. If it is purely vital records (births, marriages, deaths) then the link I posted earlier will allow you to see what certificates are online (free). Births, deaths & Catholic marriages are from 1864 and non-Catholic marriages, including Registry Office ones, from 1845.
Vital records are under registration districts. See this link to see all districts in Ireland, which ones march each other, etc.-
https://www.swilson.info/regdistmap.phpIf you are looking in a certain area or townland then this link will help find the registration district usually the same as the Poor Law Union)-
https://thecore.com/seanruad/Be aware that spelling of surnames and placenames can vary widely, The above link allows you to search part of a word, townland in a parishes and other variations which can be helpful.