@Kat Rathell
To further clarify the issue of application priority I'll give you two scenarios.
Situation 1 - You only have a few units. If you have multiple equally qualified applicants for a unit you do not need to give priority based on application order. Accept the one you feel best about (obviously avoiding discrimination against protected classes).
Situation 2 - You have many units (15+ for example). If you have multiple equally qualified applicants you may want to give priority based on application order. This will protect you from any potential appearance of discrimination since your decision was ultimately based on the order you received the applications. Otherwise, if you receive a complaint for discrimination and someone sees that your historically selected tenants seem to suggests that you do reject equally qualified applicants because they're from protected classes you'll probaly find yourself in trouble.
I at least hope that makes some sense and might help you in your application screening.