Trekie,
first port of call is the mirror.
Ask yourself a few questions about the idea. Was it after a few pints? Or is it something you have actually thought about in sobriety.
Is someone else out there doing it? If yes, how can you do it better?
Or do you have a better idea you haven't fully worked out?
If you do this and are happy that its still a runner ask a close friend what they think. By close friend I mean one who isn't shy about telling you you're a muppet as much as they'll tell you its great.
Not wanting to be negative but people get caught up in their own ideas and all they see is $$$$$$ so you need to bring in some objectivity and then by all means knock yourself out!
Best of luck with it.