Fireproof
https://www.amazon.com/dp/B001KEHAFI/?tag=internables02-20
You and Me Forever by Francis and Lisa Chan (Totally Free)
https://www.youandmeforever.org/download
Make sure you watch these videos, especially 3.
https://www.youandmeforever.org/study-videos
You can get the app with audio on either of the app stores: Google Play Apple