Resources for choral directors

Good morning/evening

I am a choral conductor from the state of Victoria in Australia. I am teaching my choir the Tallis motet O Nata Lux - we have a Novus Ordo mass. There are many resources out there for choral conductors, however at times it is challenging to “see the wood from the trees”!!

I was wondering if anyone was aware of some teaching resources that I could use to teach my choir the proper way to sing this motet??

Thank you in advance, Vincent Sully.