It starts with a business plan; then you do an investor search, get an introduction, present a summary of the plan and, if the investors are interested, the plan itself. With that I just summarized in one sentence what people write whole blogs and whole books about. Which probably does very little good.
You might start with Getting Financed, a chapter of one of my online books, which is free online. It's such a big topic, and that will at least get you started in your quest. Good luck with it.
Question added to topic Starting a Business • June 16, 2008
how would I go about showing my product to potential Investors?
I have a website, www.hiscrossmaker.com. I make crosses, and I've been approched by some companies to make several thousand each month! I'm only able to make 100 a week, and I need to make many more. But I want to be cautious as to whom I might talk with!