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I agree with much of Andrews post however I have never used an ND filter with mine before but that may be a useful idea for when it is daylight.
I set the ISO to as low as it can go and for exposure it is a case of trial and error depending on surroundings and lens.
As the storms were pretty close I took these recently with a 50mm lens and 18mm, it was just at sunset but still pretty dark so I used a 2 second exposure for both.
I stopped it at f5.6 but sometimes go to around 8.0.
After that I just set the trigger and went back down stairs to enjoy the storm with a beer and the family.
One thing I have noticed though is if it is during sunset and the lighting is rapidly darkening I will start at as long a short exposure as possible without overblowing the pic, as Andrew say 1/8 or as long as you can go but you do need to be on hand to set it longer as it gets darker.
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