German · Pronunciation Guide
Sounds like English 'ines' rhyming with pines: ei is 'eye', and the s at the end is a hiss rather than a buzz.
One syllable taking the full weight, which matters when counting — Germans give each number its own strong beat, eins-zwei-drei, with no reduction anywhere. Inside compound numbers the prominence shifts, as in einundzwanzig, where ein gives way to the twenty.
Listen: eins
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Ich möchte nur eins.
I want just one.
Listen: Ich möchte nur eins.
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Ich möchte nur eins uses the standalone counting form, complete with its s. The moment it modifies a noun it drops that s and takes an article ending instead: ein Buch, einen Kaffee. That is why 'just one' is eins here, while 'one book' would be ein Buch.
Getting ei wrong — 'eens' instead of 'eyens' — is the classic, and it is worth over-correcting early because the same letter pair shows up in nein, mein, klein, Wein and dozens more. A subtler error is buzzing the final s: English voices s after n automatically in pens and wins, but German keeps it a clean hiss at the end of a word.