Use 1 inch margins all around.
No, it is not. It is more like Chicago Style.
There isn't a rule of thumb in APA format; there are too many rules.
No, ordinances are not subject to APA rule making procedures.
yes rules can be rules
How to Use the 'Rule of Thirds' in Photography
How to Write Rules for Sequences
How to Identify the Rule When Given the Terms of Sequences
L'Hopital's Rule Example 2