I'll answer your question in two parts. First, "finding investors," then "find the right investors."
In my 15 years of helping clients raise millions in investor funding, I have found that by far the best method of finding investors is to leverage your personal network of connections. Most of the deals get done that way. Put the majority of your efforts into casting a wide net with efficient networking. Be prepared with a concise summary of your business plan and use a contact management system to track the process. When you get a "no," always ask for two or more referrals, which may lead you to other investors who might be interested in your deal. Angel groups and other startup events may be useful, too. Online sites like Angel List usually don't produce results until you have some solid traction on your round or you have a well-respected lead investor on board.
Finding the "right" investors is another matter. Smart money is always preferable, so focus your networking activities on finding investors with relevant domain experience or connections. And make sure you follow your instincts about the person. It's just as important for you to perform due diligence on any investor!
Finally, don't approach investors for money until your business plan demonstrates enough of the right stuff so that investors will take you seriously. How do know if you've crossed that threshold? Take my free Minimum Fundable Company Test at mfctest.com to find out. The results will pinpoint any areas you need to work on.