You'll find some links to chapters of my Photography Essentials book below that might help you with ways to think about artificial light.
I've always admired books like "Looking at Photographs" by John Szarkowski (still the best book ever written on photography) and "Six Easy Pieces" by the physicist Richard Feynman. Books that were written with a simple conversational voice while still making the "big ideas" completely accessable to everyone.
When I was writing the book I was probably writing it for you; but I was really thinking of the "you" two years ago, back when you were still the high school photo nerds, not the sophisticated, erudite artistes you have all become (running around Chelsea wearing berets, smoking Gauloises and sipping absinthe). Some of it might seem a little simple now, but the technical points are all still valid and might help.
The fill in flash section is at the end of chapter 6, the whole chapter was too big for the server so it starts in the middle.
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Chapter 7 has a little primer on three point lighting
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Chapter 9 has a few ideas on using flash in the field and "painting with light"
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and Chapter 10 has a section on the importance of size-distance regarding light sources.
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Chapter 8 is actually about shooting events, but there are a couple of useful quick tips on using flash with "progam" as a safety net.
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These PDF's are from my authors "review" go around, they aren't the final book. There are a couple of mistakes and typos that have been fixed but don't show up in the PDF's.
They are also super top secret "your eye's only" , my publishers would probably be pissed if they knew I had made them public, so don't send them to your friends or anything like that.
There ya go
