When writing an outline, it is best to be specific in your phrases or sentences. Do not worry about having too many lines. It would pay off later when you are writing the essay and using the outline as basis. However, keep each line short so that each takes only one line.
There is no rule on how your essay or outline should be arranged but there are common structures or arrangements. For instance, some start from general and move to specific topics. Others use narrative or a chronological structure.
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So for today’s writers, it is important and imperative that they use bullet points and sub-paragraphs in academic essays for better delivery and better comprehension (for the reader).The researched materials will be easier to format for the writer and the paper will be easier to process for the reader when applying bullet points and sub-paragraphs.