I need to learn this song and my teacher says the words but she goes through it way too quickly and doesn't write out on the whiteboard or anything on how to pronounce it? Please help and put down how to pronounce it? Thank you so much if you can help!

I checked YouTube. There are videos of it there (various Catholic groups singing), so you might get a better feel for the pronunciation.

Veni, Creator Spiritus - YouTube

Ah, I found this --

Veni Creator Spiritus-Latin Pronunciation

VENI, Creator Spiritus,
Mentes tuorum visita,
Imple superna gratia
Quae tu creasti pectora.
.
Qui diceris Paraclitus,
Altissimi donum Dei,
Fons vivus, ignis, caritas,
Et spiritalis unctio.

Tu, septiformis munere,
Digitus paternae dexterae,
Tu rite promissum Patris,
Sermone ditans guttura.

Accende lumen sensibus:
Infunde amorem cordibus:
Infirma nostri corporis
virtute firmans perpeti.

Hostem repellas longius,
Pacemque dones protinus:
Ductore sic te praevio
vitemus omne noxium.

Per te sciamus da Patrem,
Noscamus atque Filium;
Teque utriusque Spiritum
Credamus omni tempore.

Deo Patri sit gloria,
Et Filio, qui a mortuis
Surrexit, ac Paraclito,
In saeculorum saecula.
Amen.
Amen.