How do I write something in Irish?
Modern Irish uses the regular latin alphabet, so any normal font will work fine, as long as it has the accented vowels — which most do. You can experiment with all kinds of fonts here: http://www.ellipsix.net/textwriter/render.jsp
The pronunciation of Irish varies widely throughout Ireland, but there are three principal dialects (Munster, Connaught, and Ulster) and each of them have more things in common with each other than differences. What follows is a general layout of how the letter combinations in Irish are pronounced, with a bias toward the Connaught dialect.
The Irish Gaelic alphabet is made up of the following letters: