How to make myself visibile in the Internet Marketing age?

Hey I want to dive into the field of Internet marketing. I know about blogging and what they are? But I do not know how to write good to be recognized. I mean that I should start blogging about? I mean I should keep an area of particular interest to me or diversify. And also I need some more tips on increasing my presence on the web. I know you people will answer me for the same reason. Please guide me to a valuable resource