You can get a list of Irish schools on a county-by-county basis from the Department of Education and Skills.
You should gather as much information as possible about the schools in which you are interested. Schools can vary quite considerably in the ways in which they operate and the emphasis they put on areas such as exams, sports, the arts, personal development, religion, social affairs, European languages and practical skills acquisition.
Talk to teachers and, if possible, to other parents in order to see whether the school is likely to meet the needs of your particular child.
Some schools will have a waiting list. You will need to investigate the enrolment policy of the school in which you are interested and in general you should plan the enrolment of your child well in advance.
If you are planning to remain abroad and to send your child to an Irish school as an overseas student, you can choose from a range of fee-paying secondary schools (such as a boarding school or a day secondary school) that arrange accommodation and guardianship, as appropriate.