There is no great place to get help specially if you don't know the person who wishes to fund your idea, unless otherwise they are already known around the world. If you want someone you can trust you can start looking around your friends and colleagues that you think will agree to your great idea. If they do and if they think it's a really good one, then the next step is for you to get them onboard. You can ask them to be managerial partners or financial investors. The key is to start from the inside of your circle because they are the ones that you can trust. If they can't invest but likes your idea, then maybe you can ask them if they can refer someone they know who might be interested in investing. You'll expand your contacts and make more friends in the process. Or if you don't like that idea, you can try looking for a community of investors in your area it's just a matter of knowing where to look for them. Cheers!
Your Idea might be great or in fact the best out there, but at the starting/early stage chances of getting funded are slim and its best for an entrepreneur to not get funded at this stage of a startup.
I would recommend a book that summarizes all the crucial steps needed for a startup before trying to get funds ,including making the first prototype with little to no cost.
A must read for every first time Entrepreneur