I do agree with edenfalling that in fanfiction I don't have to introduce any characters or describe them in great detail. I don't even have to describe the common locations that the characters will be found in. Since I hate describing things like that anyhow (I tend to skip over reading them in real books ;p), that's an added bonus for me in fanfiction.
The actual writing, however, is pretty much the same. World-building, plot, ideas, continuity, and keeping all the threads of your story in hand and weaving them together to make a coherent whole. Everything that puts together the shadow that people see. :)
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I do agree with edenfalling that in fanfiction I don't have to introduce any characters or describe them in great detail. I don't even have to describe the common locations that the characters will be found in. Since I hate describing things like that anyhow (I tend to skip over reading them in real books ;p), that's an added bonus for me in fanfiction.
The actual writing, however, is pretty much the same. World-building, plot, ideas, continuity, and keeping all the threads of your story in hand and weaving them together to make a coherent whole. Everything that puts together the shadow that people see. :)