How do you suggest I lit them without having the rooms lights on?
Ahhh... The wonders of filmmaking.
We create the mood using the equipment available to us. Our
job is to trick the audience using creative methods. What seems
like a scene in a room with no lights on is really well lit.
You've gotten some excellent suggestions - now is when YOU
experiment and learn and grow as a filmmaker. There isn't
one or two pieces of equipment that will do the job for you.
It is the skill and experience of the people making the movie.
Use the lens you have right now. Make a few "movie" lights with
what you have around the house and experiment. With some
foil and cardboard you can make "flags" that will direct the light.
Bounce the light so it doesn't fall directly on the actors. Use your
cameras shutter.
Get creative; the room cannot be totally dark, find a creative
way to have a little light spill into the room so the audience can
see what's going on. Go back and watch a few of your favorite
horror movies with a more critical eye; think of how the dark scenes
might have been lit.
Any movie or scene in a movie you thought looked really good?