Good storytelling techniques can go a long way in enhancing a Bible lesson, especially a narrative type lesson.
Use a wide range of voice inflection. Raise your voice when a person in the lesson is angry, lower it when they are sad. Slow down when the person is being thoughtful or deliberate, speed up when when they are excited. Put yourself in that person's shoes and do a little acting.
Verse 3: Make the king of Israel's voice frustrated and pleading with a touch of worried anger) when responding to Naaman, "Am I God, to kill and make alive, that this man sends a man to me to heal him of his leprosy? Therefore please consider, and see how he seeks a quarrel with me."
Verse 7: Let Naaman's maid be excited when she says to his wife, "If only my master were with the prophet who is in Samaria! For he would heal him of his leprosy."
These techniques can also be used when there is no dialog.