The readings in bold can be used as a minimum.
After each reading, you could have a few minutes of silence, or a brief discussion about the passage, or a time of prayer. You should have at least one period of silence. You could also incorporate some singing at different points.
Vigils are traditionally held in the dark, except for essential lighting. If you want to follow this, you can turn off the lights and just leave one on for the Bible readings. You could also use candle light. This anticipates the sunrise that is to follow on Resurrection Sunday.