In your opinion, what is the best way to advertise a website?

I made a website with an organisation I really have a passion for! Does anyone know the best way to advertise it on the internet? Please let me know! Any comments or suggestions will be appreciated! Also, I'm sixteen so I cannot pay for advertising. Thank you!
Update: I haven't already said this, but I am NOT looking to advertise it on yahoo answers! I just want to advertise it on the internet. Would having the website help?

http://support.worldvision.org/site/TR/3...

There it is. How can I advertise this on the internet???
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