Interesting question.
Maybe have a look here Google Public Data Explorer You can access some interesting datasets which are real life.
There may be other stats available perhaps in a subject that interests you, sport for example.
I find it easier to create interesting reports with data you understand and can relate to in real life.
As others have mentioned there's a lot of example dashboards on the net on any subject you care to think of which will give you an idea on which charts to include.
As for the build, well that depends on your data. So that's you main priority. Good interesting data.
Good luck
Richard
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