Ciamar a tha thu, mo charaid? (How are you, my friend?)Well, it's not an easy question you pose. Is it Scottish Gaelic (aka Gaelic) or Irish Gaelic (aka Irish) which you are interested in? Each of these languages have their own regional dialects as well.
You might find a site giving some Gaelic pronunciation, but they would or should be specifying the dialect they are describing.