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First take a deep breath and Relax. Go ahead, we'll wait.....
Now, you can never give too much space, so look hard at what you have available. Dump all the head spinning info for the moment and think like a bantam.
Imagine you're the size of a breadbox, or a flower vase - in fact, take a flower vase to wherever you intend to build your coop and use that to guage by.
How much space would YOU need, then?
Do you have it? If so, great - start there and build out as far as you can allow.
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Most people feel uncomfortable with such loosey-goosey information, however. They want formulas and numbers, lists, internet links and cross reference data, etc. Hey, its the times we live in, so it's understandable.
So, if you still feel the need for something more formulaic, then use 2-3 sq ft in the coop and 10 square feet in the run. Now go, and build!