With the help of ChineseBay.com's Cantonese Pronunciation Dictionary, we can start some easy lessons for missionary.
1. 神是愛 （God is love).
2. 耶穌是我哋嘅救主 （Jesus is our savior).
3. 我愛耶穌 （ I love Jesus).
4. 我愛耶和華 （I love Jehovah).
5. 神愛世人 （God loves the world).
For pronunciation, you may click the above Chinese to get the Jyutping (Cantonese pronunciation) for those characters.
Here's an introduction of Jyutping Lessons that you may follow. (Master Jyutping, and your are free):
After you master the Jyutping you may use the Jyutping Dictionary to learn the Cantonese pronunciation of all the Chinese characters.
Cantonese for Missionaries and Cantonese for Pastors. It means as a missionary or pastor who meet Cantonese a lot, they need to learn this basic Cantonese.