You don't have to be particularly outgoing to get on the media's list of dependable guests and resources. Just let producers, hosts, editors, bloggers and other media decision-makers know that your schedule is fairly flexible.
Of course, you probably know a 12-year-old who can design your site. Don't hire him or her. There are places to save a dollar, and website design and implementation isn't it. Your reputation, as an author, depends on how good you look online.