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If you like entertainment you should start to keep up with online trade papers like Variety, The Hollywood Reporter and Entertainment Weekly. Read as many books as you can get your hands on, because you never know what will be adapted into a film. Watch TV and movies that you normally wouldn't give a chance and then analize them to see what made you think they were great or terrible.
Have fun with it because entertainment can be a lot of work, but it can also a really exciting and fun field.