A little backstory on me --I didn't grow up in a Christian home, but became a believer at age 13 and started attending church. The church I attended for youth group put a lot of emphasis on "don't do this" and a list of rules. I wound up throwing out all of my secular music, for example, because I was led to believe that if I was "really serious" about being a believer, I would only listen to music labelled as Christian. I agonized over seeing the movie Shrek when it came out in theaters because it contained magic and I was led to believe that all representations of magic in media were bad --even in a movie parodying fairy tales. I, of course, didn't read Harry Potter cause that was just seriously frowned upon and we were told we were opening the door for demons if we read it. XP
It took a long time to escape from that mindset drilled into me when I was a new believer and trying to figure out what following Christ meant. The set of rules never did me any good --it just put weights on me and led me to believe I had to somehow earn/keep God's favor by following them and included fear that God wouldn't love me anymore if I messed up. It is a debilitating mindset and thing to be under. Be careful not to fall too far in the direction of legalism (at the same time, do use discretion and if something sends up a red flag, that's probably something to pay attention to).
I agree with ClosetOtaku in not setting a list of rules and dos/don'ts. If you feel that something would be a sin or a stumbling block for you personally to watch, don't watch it. Don't put yourself in that position. But what may be a stumbling block for you wouldn't necessarily be one for someone else.
There is a lot of good artistry out there in secular media. We can, as believers, appreciate it and enjoy it --as long as it doesn't blaspheme God or, of course, consist of explicit content. Overall, allow the Spirit to guide you --if something doesn't feel right, don't watch/listen to that thing and watch/listen to something else.
(And, yes, I did finally read all of the Harry Potter books in college and loved them.
"Therefore we do not lose heart. Though outwardly we are wasting away, yet inwardly we are being renewed day by day. For our light and momentary troubles are achieving for us an eternal glory that far outweighs them all. So we fix our eyes not on what is seen, but on what is unseen. For what is seen is temporary, but what is unseen is eternal." 2 Corinthians 4:16-18
"Since the creation of the Internet, the Earth's rotation has been fueled, primarily, by the collective spinning of English teachers in their graves."