Unless you have a working prototype proving your game design/idea is actually fun, engaging and/or addictive, then it's just a text document (if you have one) describing a dream, an abstract thought which is indistinguishable from every other abstract though that every other person in the world has. And nobody (who isn't your close friend and has a passion for that same idea) is going to help you make it unless they get paid a variable amount of money, depending on what you're asking them to do and how much time you're asking them to do it in.
Don't worry about ideas and designs. Nobody is going to steal them. And even if they do and actually make a game from it, it's not going to be the same thing you envisioned. Unless that other person is your clone, but i'm fairly certain we don't have the technology for full grown clones yet.