Thank you for the clarification! It's wonderful to hear that you're planning on coming to stay and work here on our little island.
To learn more about working on the island of Ireland, you may find the resources below useful.
The Citizens Information Website
contains a full section of support for coming to live and work in the Republic of Ireland. For information on Northern Ireland, please have a look at the NIDirect
page for the relevant information.
In addition, I agree with the advice Antoin offered. I'd also recommend that you directly contact your local Irish Embassy/Consulate
prior to travelling to the Republic of Ireland, and your local British Embassy/High Commission
or Consular Office, should you wish to fly into Northern Ireland.
I do hope that this helps! Good luck!