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You are pretty much correct about the click count. I'm not a scope clicker except for prairie dogs way out there, but the way you describe it is fine.
If your scope moves impact 1/4" at 100 yards, it will move it roughly 1/2" at 200, 3/4" at 300 and so forth.
For a fairly accurate drop chart, any of the computer-based ballistic programs will give that to you in several ways. You could get a spreadsheet presentation, a graph of trajectory lines or both. Note that any such chart is only as reliable as the numbers you put into it. The ballistic coefficient and muzzle velocity have to be correct. Unfortunately, both of them tend to change, so no drop chart is ever smack on. Knowing the exact range is also vital.
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