I've done some beginning work on an idea for what I describe as a True Education Management System, one that focuses on both the community (and by community I mean all users of this WebApp, not just the school or school-district) and being much more than a very expensive fancy agenda for schools and I want to know how I could find developers for said product. That's an overly brief explanation of the idea because I don't have a patent yet.
I've spoken with one VC and he basically said "Do as much as you can by yourself" but I don't know how much more I could do by myself, I have a very limited knowledge of databases and a much less limited knowledge of Silverlight (It's being done primarily in Silverlight), and I feel like if I had developers who wanted to work with me who had majored in Computer Science or at least has a good overall knowledge of Silverlight would be able to do a considerably better job than I can, and my school work wouldn't be suffering as much as a result.
Any help would be appreciated
I don't know if a site like http://www.quirky.com/ might be of help to you - the idea is you can share ideas and get people to help in exchange for a % of your product - but it's usually for physical products rather than ideas.
You could also look at either kickstarter.com or indiegogo.com as sources for raising money, and then go on to hire a developer. Maybe you could go to a university in the area you live and try and talk to someone in the computer science departments. It would probably be a useful experience for someone studying those majors, although I'm not really convinced Silverlight is the way forward - it's obviously a big decision you'll have to make.
Anyway, good luck with it - I hope it works out well for you.
Here's how I see it (and I apologize if this is seen as "rude", I'm not trying to be). You are 15 and have a considerable amount of living to do. You don't seem to have any money to pay a developer upfront, which means that they may put in the work to see a % of the profit in return. But, the catch is that since you're 15 people may not think that you'll stick with it for very long and that their work will get them nothing. They may put in 20 to 30 hours of work on this project and then come to find that you have moved on to something else, which means they wasted 20 to 30 hours of their time.
Something that comes to mind is: why Silverlight? There are many other options that would lend itself to finding a developer easier than using Silverlight. When starting a company, the technology is very important because it can impact your costs in the future and I think Silverlight is a risky choice unless you know something I don't (which is quite possible). That being said, I would try Craigslist since you can find people in your area. Post it on the "Computer Gigs" section and you should be able to find somebody.
BTW, realistically, there are already a lot of competitors in this space, and your idea will have no traction with investors unless you can show them a great team and a real cashflow. Not to say "don't do it", established players are often displaced by more agile newcomers, but don't expect an easy road.