Build it and they will come is how the famous line goes. The content strategy is very similar and has been used by newspapers, radio stations and television programers for generations. In a nutshell: if the content is great, it finds and audience and advertisers. Everyone is happy.
An effective content strategy online is similar. Great content properly distributed and seeded finds and audience and helps marketers educate consumers. As a bonus, great content can also help build an effective web presence and enhance your search engine optimization.
How do you get started? Learn about your target audience. Find out what they talking about, what interests them. Then start creating what interests them.