APA = American Psychological Association, a professional society for psychology and the governing body of APA Style.
A proper student APA paper has 3 pages minimum: title page, the paper, and the references.
Size 12 font, double-spaced everywhere. There is no font requirement as long as the same font is used throughout the text of the paper. Accepted fonts include Calibri 11, Arial 11, Lucida Sans Unicode 10, Times New Roman 12, and Georgia 11.