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i too had a bit of issues taking flats with maxim untill i figured one thing out...
That is making sure you know what the dynamic range of your CCD is, if its 16bit, youll have 65000 adu approximately. Now i use the 14bit 40d, which is considerably less than 65000, so i was aiming for about 20-25k adu.... wrong!
So follow what decepti said, but just bare in mind also about your dynamic range.
Oh for a really cheap and good quality light box i built one out of a Broccoli box, 2 Cold cathode 300mm fluros, a piece of white foam board from office works and a bit of duct tape. all up set me back $35 bucks and i never looked back.
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