Just play around with the blocks, I'm sure you'll make something cool.
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I agree with ian528, play around with the blocks and see what they do (especially ones in the control and sensing sections if you want to learn about games), then start combining them into scripts. See what you can figure out, and if you ever get stuck, there's multitudes of Scratchers ready to help with a specific problem and plenty of tutorial projects around.
And don't worry, we all start without a clue.
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