I kinda figured you just don't set out to invent "something". I always figured you stumble onto something and then coin it. If you have a sure fire idea and are rightfully hesitant to reveal it without having it stolen, then find an attorney to write you up some disclosure agreements to have signed with whoever you decide to share your idea with.
Having watch the TV show "American Inventor", it seems like some good ideas just weren't good enough. I think you'll need a certain percentage of population interest before you can find a backer$.