If you want to learn authentic Munster Gaoluinn then I recommend “Teach Yourself Irish” (old version 1961, Dillon & Ó Cróinín). .
Yes this seems to be highly recommended for Munster Irish. I’ll try to source audio to accompany it if it exists. I bought ‘Gaschaint’ a phrase book (2000 daily phrases to use with a child) recently. I think it’s great as there’s audio included from a native Munster Irish speaker. It’s important to me to really improve my pronunciation (caol and leathan consonants, tongue, lip position etc) as the quality of my daughter’s Irish would depend almost totally on mine. I was never taught this in school or teacher training. We were just allowed to use English consonants and vowels rather than Irish sounds. My great grandmother was a native speaker from Múscraí so I think it would be a lovely thing for my daughter to have Gaelainn.