If your idea is somewhat like a product, then you can file a patent. This way, you'll receive everything they earned from it and they're barred from using it in the future.

If it's just like a general game plan, you're much better off simply investing in the resources for execution yourself. That's really your only option since you don't seem like you want to trust anyone. You can't sell an idea if you don't give details after all.

going mainstream is about it going public where people can get their hands on it very easily from different locations.

if your thinking about licencing your idea to only be used by certain companies where they have no competition, then your idea wont work.
(your limiting the userbase)
if your thinking your idea is to be used by many companies where they have competition, then your hope of getting rich from one company wont work.

really have a think about the end user and how you think they will get access to your idea. think about what current companies will be your access avenue to the masses.

be aware many 'new' entrepreneurs will dazzle you with big sums and say you can get X% royalty per time the idea is used. but you need to disclose your idea to them. they then patent it with a clause/adjustment.. an get you to sign the royalty agreement against that patent
and then they shelve it.. never to use it

then they release a separate patent without the clause/adjustment that is different enough to not infringe the first patent. and thats the one they run with.. without your royalty payment tied to it

... things to think about


 

What is your idea, why do not you post in this forum, because this forum where to find a solution, not necessarily you sell your ideas, you better share your ideas in general to understand.

If you do have a genuine idea and it's original you'll likely need to get the person interested to sign a non disclosure contract. That's what's normally done in these types of situations where someone has an idea but, is wary of the person stealing the concept. Even then though I would only suggest doing this with trustworthy people.