I am a builder in Canada. I am looking for people to invest in building houses with me. How do I find investors?
You are looking for big fish. Big investors like that wouldn't look for opportunities in newspapers. They'd look to their social network for recommendations. Family, friends, industry affiliates, get the picture? The question you should be asking then is, "How do I get in that circle?"
Join communities, organizations, clubs, online or not. Find where the big fish are and make yourself a valued member of that community. Don't sell. That's a big turn-off. When you introduce yourself, simply mention that you are into ___. This method will take longer, but will pay off in the long term. And you make good friends in the process.