There are lot of ways that you can learn Voice and accent training
Train the trainer
Online Classes
Audio books and lessons
well I would recommend a classroom train the trainer. There a lot of institutes that provide these. You can also try TEFL courses.
The topics you need to understand are as follows
Phonetics
Syllables
Syllable Stress
Sentence stress
Intonation
Word Contractions and liaisons.
There is lot more to this but these are a few topics to start of with.
Let me know if you know if you need clarification on any of the above
Regards
Prabha
