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Depends on what type of idea...
Software? Learn to code, or start writing use cases and hire a developer or 10.
Physical object/tool/thing? Learn to use one of the free basic cad type programs and draw it out, then go to a pro to do it for real. Then patent and find manufacturer(s).
Time travel? Go to school, get PhD, get PostDoc, get tenured research position until you get bought out by a private company
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