Ideas are a dime a dozen, it's how you execute that matters. You'll have to share a little more in order to get a better answer on what to do next... is it a physical product? If so, high tech or low tech, what do you think it would cost to produce, and is it something that would work as an infomercial?
If it's not a physical product (software or a web service) what kind of technologies would be needed to develop it? Have you done any research to see if something similar to your idea is already out there?
"The secret to discipline is remembering what you want" -- David Campbell
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