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You know what you want to find out? Just to make sure - write it down!
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Read up about validity. Do you have a valid question?
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Read the hub on experimental design, and the chapter on the same topic here
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Decide about the exact question and the experimental design. Write it down.
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Play through the processes of collecting your data: simulate it through in your mind or in R, make up some data, write it down. Everything seems OK?
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Play through the process of analysing your data. Can you answer your original question? Do a power analysis!
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Based on 5/6 revise 4 if nececssary
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Write down final approach