In your case, there are several people who are interested in TV type books, whether it can be made into a show or movie later, or if it's about shows. Even if you're not interested in self-publishing, it gives a lot of inside info about the business and its working. With a query, you can send to more people at one time because the cost is less. If it's fiction, send a query and if you like the first 1-3 sample chapters. If you research the person you're going to send it to, you will find they'll tell what they prefer.
Some publishers only accept from agents.
Some only want a query, some want query and sample chapters. Regardless of what you decide to send, make their mouth water for more. Believe in yourself. Believe you CAN do it. If you can't SEE it, before you SEE it, then possibly you may never see it.