This is me chacking my email but not logging into lj at work.
KEEP WRITING. Everything can be fixed up in the second draft, or by your editor if it survives to later versions. The truly hard and essential parts of a novel are not technical, they are the idea and the accomplishment. You've had the idea, so you're a step ahead, but getting it all down defeats many, if not most, writers.
Get it all down and then worry about the technical side. It is very unlikely that any of these details will have major impacts on where your story goes as a story (though some, such as POV, can significantly change how it is told). And good luck!
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KEEP WRITING. Everything can be fixed up in the second draft, or by your editor if it survives to later versions. The truly hard and essential parts of a novel are not technical, they are the idea and the accomplishment. You've had the idea, so you're a step ahead, but getting it all down defeats many, if not most, writers.
Get it all down and then worry about the technical side. It is very unlikely that any of these details will have major impacts on where your story goes as a story (though some, such as POV, can significantly change how it is told). And good luck!