You will learn a lot fast just by reading the forums here on BYC at the. My interest is in the emergency thread to learn about illnesses and treatment, but there are all categories where you can pick up tips. The learning center is also good for learning about incubation, chick raising...
It could be dry skin. Coconut oil is good for that. Fungal infections such as favus can cause white chalky deposits on combs and wattles, and those can be treated with Lotrimin (clostrimazole) or Monsitat 7 (miconazole) but it looks more like dry skin with a few peck marks.