I've been playing with time-lapse for a couple years and am still learning the craft. I recently discovered software called Sequence that is cheap and works well for removing the flicker which is a major problem in time-lapse photography. The basic camera settings I use are: 1/60, f22, manual focus, cloudy WB. If I can see the clouds moving I shoot at 2 second intervals, if not then at 3 second intervals. There is some math involved since at least 300 images are needed for a short clip.