You need to use hairbrushes designed for curly hair, and hair products labeled as being for curly hair. I have fine hair (but a lot of it) and it's curly, and my middle daughter has a ton of coarser hair that's curly and wavy. The problem for both of us is that our hair dries out easily and needs major hydration, and the curls need special care and boosting so that they don't look like a cheap home perm.
I like L'Oreal EverCreme for dry to very hair, as it's amazing and smells great and has the bonus of being vegan. It's also one of the only shampoo and conditioner products that doesn't cause an eczema flare up for me. For my daughter, I use the EverCreme conditioning spray as well after a bath because it helps detangle her long hair. If I miss using it, you can tell and her hair looks fried.
I've been using the L'Oreal curl activating mousse on top of Garnier Fructis Triple Nutrition Nutrient Spray which has olive oil, avocado oil, and black currant seed oil and shea butter oil. It's very light weight and feels really silky. I use it only on the lower half of the hair that hangs down to the ends (not at the scalp).
I also have a TRESemme curl hydration lotion, which is wonderful. I love that one too and will use it interchangeably with the mousse. TRESemme is actually really good for curly hair products.