Speak to people about your idea. The inherent flaws of an idea often become apparent when you try and vocalize it to somebody. Ask people for feedback on your idea and suggestions of how it might work better.
Research TV networks. A full list of US networks is available in Resources. Click through to the most suitable network for your show. EWTN, for example, broadcasts Catholic shows so anything racy will not be suitable. MTV, on the other hand, specializes in racy shows aimed at the younger generation. The Commissioning Editor will be the person you eventually pitch to, but your first point of contact will likely be an assistant working in the commissioning department.
Write a logline for your TV show. A logline summarizes the entire concept of the show into one sentence. Hone your log line until you are certain of the selling point of your TV show.
Practice your "elevator pitch." This is a verbal pitch of your TV idea -- it should last around 30 seconds. This is an accurate estimate of the amount of time you have to hook TV executives into your idea.
Contact the relevant person at your chosen network. Send a brief, polite email including your log line and ask to arrange a meeting. Follow up on the email after two weeks if you have not had a response.