In my opinion, a good healthy first step is to realize you are almost certainly not going to be able to successfully commercialize it or be able to do anything with it that makes you any money, fame, etc.
That's just the reality of the world -- especially our current age, where information and ideas are so easy to distribute and explain.
The reality is that even when one has a truly great idea, there are most likely dozens or hundreds of people who have also had it, long before you, and are in a better position (monetarily, connection wise, etc.) to bring it to fruition.
That's not to say I am suggesting you not pursue it. Only that you do so eyes open to the reality of the situation, and placing less of a hope that your idea alone is going to be worth much if anything. If it's important to you I think you will have to embrace the idea of taking a much bigger role in actually bringing your idea to life and taking it from idea to implementation and marketing and promotion. The idea is almost certainly not worth anything, but a person who can recognize a good idea and follow through with the hard work to bring it to life is.