1.Use Formal Fonts only.
2.Full Document should be formatted well, if you use Word 2007, or any other DTP software then they provide a formatting style for headings.
3.Use Table of Contents (Automatic is better than Manual).
4.Keep proper spacing.
5.You may use two colums in one page, like many textbooks have but use it if u know perfectly!
6.There is no point in writing extra if u do not need it, you should include pictures where necessary.
If ANY POINTS ARE REPEATED, i am SORRY!