You should see the introduction to Squeak on the Scratch Wiki and this excellent guide by billyedward.
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Blockspecs go in either Scratch-Objects >> ScratchSpriteMorph/ScratchStageMorph/ScribtableScratchMorph class >> block specs >> blockspecs:
Use spriteMorph for motion, looks, pen, sensing. Use stageMorph for Stage blocks in those categories. Anything else in ScribtableScratchMorph.
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