The Google Display Network is a powerful medium to expose your brand to a wide range of new users who might not yet be searching on Google for your product. Sophisticated website and user based targets as well as layered demographic targeting allows you to experiment and find your audience, no matter how niche it is. Be sure to plan ahead though! The Google Display Network has over 3,000 predefined targeting options and is adding more all the time. We’ve compiled the most up to date list of GDN targets for download here to help you best plan display efforts and find new successful methods of targeting.
Email marketing is still one of the best methods you can use, not only for making money online, but also for driving visitors to whatever it is that you're promoting. You can either build your own email list using lead magnets and sales funnels, or you can run solo ads through solo ad providers or email list brokers. Just search for the topic + " email list broker" in Google.