Name: Dave Paul Puna, HI (Zone 10b) Live in a rainforest, get wet feet.
Hi Caroline, most details for care concern proper watering (not too much, not too little), proper fertilizing (I like regular liquid feeding a couple times a month with Miracle Grow), good drainage in a pot, and possible transplanting to a larger pot so the plant can expand.
Maybe these links about Spathiphyllum, Peace Lily will help.