French · Pronunciation Guide
voo — one syllable, with the "s" silent and the lips pushed well forward for the "oo".
A single unstressed syllable in most sentences, though "vous" can be emphasised on its own when it is the answer to a question. Inside a phrase it stays quick and leans on the verb.
Listen: vous
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Vous êtes très aimable.
You are very kind.
Listen: Vous êtes très aimable.
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"Vous êtes très aimable" is a liaison showcase: "vous êtes" is /vu.z‿ɛt/, with that silent "s" surfacing as a "z", and "très aimable" is /tʁɛ.z‿ɛ.mabl/, where the silent "s" of "très" does exactly the same thing. Skip either link and the sentence sounds chopped up. The final "-ble" of "aimable" is a consonant cluster with barely any vowel after it.
The obvious slip is pronouncing the "s", giving "voose", which happens because English never leaves a final "s" silent. Just as common is confusing this vowel with the "u" of "tu": "vous" has the back, rounded /u/, while "tu" has the forward /y/. Getting them backwards swaps formal and informal address, so the two are worth learning as a contrasting pair.