To avoid root rot, a money tree needs a sandy, peat-moss-based soil and a pot with good drainage. Although it likes humidity in general, you should let its soil dry out between watering. A good schedule for most environments is to water when the top 2-4 inches of soil are dry. Water thoroughly, until water flows out the drainage holes of the pot, and pour out the excess from the tray so that the roots don't sit in water.
During the growing season, fertilize once a month with a liquid plant food at half strength, but skip fertilizer in the winter.