Before submitting your application it is essential to gather as much information as possible about :
The course of study you are planning to take
The institution you are planning to attend.
How to apply to a higher education institution in Ireland depends on whether you are an EU or a non-EU candidate.
Once you are happy with your choices you will need time to gather the necessary paperwork, arrange accommodation, visa, funding etc.
Our advice would be to begin the application process at least one year in advance of your proposed arrival in Ireland.