I guess I'm most comfortable with the style seen in biological journals, where citations are by name and year. If you use text verbatim, you must use quotation marks. But keep direct quotes to a minimum. Length means absolutely nothing . But 20 point papers usually run several pages at least.
Most students use word processing software.
But I don't mind if your paper is handwritten, as long as its legible. But feel free to xerox illustrations or data tables. In fact, it would help me if you attached whole copies of any relevant articles you may have xeroxed in the library. It's not necessary, but it makes my life easier. Papers are due the day of our final exam , at the start of the period.