i set ISO at 200 at the motorshow, under normal lighting
condition aperture would be set at ard 3.8, exposure lighting at
1/15sec. That's the average settings for the photo i take.
The higher yr ISO, the more noise u will get. The higher yr F, the
darker yr pics get, so 4 would be alright for yr pics. Shutter
speed, the longer you set, the longer yr shutters will be open,
therefore capturing more lights and making yr pics brighter.
hope it helps 
