I am going to photograph in Central Park in the dark once The Gates have been completed. I don't know anything about night photography, but am about to go to the library to do some research and would also like some advice. What aperture should I use? Would it be best to leave on Auto and let the camera close shutter at will? Or should I use Bulb? What type of color film would be best? I've never really shot color before. I have a tripod. Will I just need to experiment?