Once you have the setup ready to shoot, there are couple of camera settings should be tweaked. If you're using a point & shoot to make your time-lapse, then most probably you would have no option of changing the shutter intervals but that shouldn't be a problem since the standard settings should be sufficient enough. On the other hand, if you are using a dSLR to make your time-lapse movie, you first need to do a couple of trial runs to get the frame rate right. Anything too slow could drag on and wouldn't make it interesting and if it's too fast it loses its appeal. So first try a trial run say for 2 or 3 minutes and experiment with different frame rates (the number of pictures to be taken and the time interval).
Finally the images can be combined using QuickTime Pro (cheapest option) to create your time lapse movie. I suggest you have look at this video to get an idea about the whole process. Have fun shooting.