Read the script several times. Plot out some basic lighting schemes and plans. If you have ideas about certain metaphors or statements, jot down some notes. Set up a meeting with the director and supervising producers. Explain your ideas and ask for feedback. See what ideas they have on the topic.
Look at the available light on set if there is any. When possible, you want to use the available light and simply add to it with bounce cards and , when necessary, additional lighting. Set up the camera for the first shot; this will show you what needs to be lit so you don't waste your time lighting things that won't be seen in the first sequence.
Start with the available light source if there is one and build your three-point lighting system around it. Take a photo with a Polaroid or digital camera to see the result. This give you an instant idea of what will be seen on film and how the shading and shadowing will look different on film than it does to the human eye.
Apply soft boxes to the light heads if the light cast on the subjects is too harsh. To create directional lighting, put barn doors on the light head and move the barn doors (with gloves) to point the light where you need it. Insert a filter in front of the light to change the tone or coloring of the light being cast.
Create a statement or metaphor by highlighting certain aspects or items that usually would be simply blurry background details. Use tungsten lighting to create a reddish tone on all the subjects. Experiment with different lighting conditions and create makeshift lighting instruments to make a new, inventive way of doing things. Be a pioneer. Have fun!