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1. A dark frame is one taken at the same exposure and temperature as the shots you are taking, this is subsquently subtracted from your image. but for short exposures ie less than 30 secs i probably wouldnt bother.
2. flat is a shot taken with a lightbox or similar to show dustmotes vingetting etc. varios programs will do the manipulating for you.
a simple and free way of stacking images is to convert your files to a bitmap or tiff and stack in registax, (if its being tracked with no rotation)
a couple of usefull books to explain the nitty gritty is THE new ccd astonomy by Ron Wodowski, and The handbook of astronomical image processing by richard Berry which also has software included that will do all those things discussed
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