Where to find sellers and buyers? Please help

[Mesha Graham]

I have so many questions about how to actually find sellers and buyers. I know Craigslist is a good source to begin for a newbie like self, to find a seller. I know marketing online, direct mail are great ways to target sellers, But how do I find buyers? Is there a source where I can go to find buyers? Where do I begin my search? Please help!