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Writing for a show and characters you are connected to will come across as more authentic than writing for a show just because it is popular. Do not write an original show idea. Show executives want to know if you can write in a preexisting world without drastically changing the show's dynamic or losing your unique voice. An established show is better than a brand new one since it will likely still be on the air when your script is ready to send out. This is not the time to drastically change the path of the show or showcase your new ideas. Stay true to the characters and storyline to prove that you can work within the established world of the show.  Think about the storyline the show revolves around. If it is a mystery, do not solve the mystery in your episode. Similarly do not write an episode in which two characters finally become a couple if the show revolves around their romantic tension. It is also best to not kill off any characters in your spec script. Do not revisit or rewrite the show's history. You should keep your script within the confines of present day for the show. Your script should be free of flashbacks and mythology. Edit your script, then edit it again. Watch the TV show you are writing an episode for and then go back to your script to make sure the writing stays true to the show. Is the dialogue believable for the show? Are your stage directions realistic within the confines of the series? Family and friends are not ideal as they are often too close to you to be honest. Look for writer's groups, either online or in person, to exchange ideas and editing services with. These groups will help you hone your craft. They will also help you learn to accept rejection gracefully. You will need at least two speculative (spec) scripts to break into the entertainment writing business. For television this will be two episodic screenplays of a TV show. This is how you will show executives and showrunners your writing ability and it is essentially your resume. You also want to make sure you have one ready to send in immediately if it is requested.
Choose a network TV show you love to watch. Write a typical episode. Refine your writing. Seek out editors. Begin a second script.