First you are going to need a melody that is both catchy and spooky. Then you can start to write some lyrics that fit the music and tone. You might want to consider what aspect of the game you want to cover. As I assume you want to cover the lore of FNF with your song, I advise that you try to make a coherent theme with characters and events from the video games, lore snippets and possibly even fanart. Try to give the song some personality by adding distinctive elements and a creative blend of old and new ideas so that you don't accidentally replicate one of the existing songs or fail to stick out from the crowd. That is the advice that I can give you. This can be extrapolated and applied to write any type of song.
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