I'm spell checking and spell check wants to capitalize the first word of each
line how do I set the document to keep this from occuring?
Stop hitting the return key for each new line. You are not typing on a
typewriter anymore, so Word will take care of the line wraps for you
automatically. (You haven't heard the margin warning bell for a while,
have you? :

) If you must do manual line breaks, use shift+return
instead.
Explanation: In word processors, the return key inserts a paragraph
break, not a simple line break. The paragraph is the strongest form of
punctuation in flowing text, and implies a new sentence.