Read. Write. Daydream and value your “moodling” (creative thought) time. Repeat.
Here are some of my favourite books on writing–remember, this kind of list is always subjective–with a slight slant toward film and TV work.
I learned the importance of giving myself “moodling time” during years of being employed as a writer, story editor, and writing instructor. The term comes from Brenda Ueland’s 1938 classic book, If You Want To Write: A Book about Art, Independence and Spirit.
TV viewing tastes are subjective, and I’m not a fan of TV series snobbery. One person’s love of Futurama is no less pleasurable than another person’s enjoyment of Big Bang Theory or Game of Thrones. That said, there are some basic things a television writer needs to know and to take into consideration when s/he is writing a TV spec script or working on an original television series idea in a TV pilot bible.