APA outline templates are included in word processing programs such as Microsoft Word or Open Office. You can also find them online from reputable online sources, such as the Purdue Owl.
Using a word processing program that includes outline templates is the easiest way to make sure your outline is in the correct format. Use the program's help feature if you don't know how to use the template. In general, pressing Enter after a line creates a new entry at the same level, and pressing tab at the beginning of a line advances to the next level of the outline.