Yes, I know the question goes a little deeper, but just about any answer would be appreciated. You don't have to be able to answer all the subquestions posted.
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WitikoI would be most grateful for any links to helpful articles about the
ancient english, or recommendations regarding good literature on this topic.
You could start from the references (both books and links) provided at the very end of this page from Wikipedia: Old English.
Kristofferyou should start with history of English language. Then you will know where to search.