Answer:
The most important thing you can do to begin is to understand the Wysong feeding philosophy. This will help you do that.

Intermittent Feeding: http://www.wysong.net/pet-health-and-nutrition/why-intermittent-feeding.php

Myth of the 100% Complete Pet Food: http://www.wysong.net/pet-health-and-nutrition/the-100-percent-complete-pet-food-myth.php

What Diet To Begin With: http://www.wysong.net/pet-health-and-nutrition/what-diet-to-begin-with.php

100 Pet Health Truths: http://www.wysongpethealth.net/

Then read the Wysong Optimal Health Program.

Contrary to the common pet feeding practice of feeding one food at every meal, you will discover a variety of choices that will give your pets the best opportunity for health and long life.