That question is constantly posed to me and the answer is directly linked to why we network. What you wish to accomplish will vary with the demands and responsibilities of your position.
Information is supplied by people.
Networking is all about establishing and cultivating ongoing relationships with people. People who can help you and people who can be helped by you. Go through this simple two-step exercise. By the way, even if you have never seen yourself as a networker, most of us already have a network, we just haven't been taking advantage of it. Begin with the people who are already known to you.