La lune...
all the u sounds are the pinched "u", which I was taught to say by saying eeeeeee and then pushing the lips forward into a Clara Bow bee-sting kiss (don't blame me for having camp teachers).
The e sounds on the end of words are barely voiced.
The Au in "aucune" is a short-ish "oh" sound. Virtually all vowel sounds in French are "pure", that is a single sound, where a lot of English vowels are actually two sounds pushed together.
The r should, ideally, be lightly rolled in the back of the throat, as in gargle, though not as aggressive a sound.
The "an" indicates a nasal sound- try saying something between "ah" and "aw" down your nose.
So a sort of transcription would be
la lewn ne gard o-kewn rah-kewn