My hair isn't that curly.. more like 3a, but what I can tell you is that curls need a LOT of moisture! So its good to use deep conditioning treatments and leave conditioner on as long as possible in the shower. Also hair stylists have always told me not to use towels on my hair.. which takes out a lot moisture, and instead just blot-drying, or even using paper towels or a t-shirt.
   Leave-in conditioners are also really good for curly hair. My sister's hair is also extremely thick and very curly (probably a 3b also), and she has gotten me hooked on Mane & tail shampoo & conditioners. It was originally formulated for Horses hair which is MUCH thicker than human hair, but now is commonly used for humans.. you can get it at pretty much any drug-store & I've become a big fan also!
   Hmmm.. those are pretty much all the general things I have been told about how to care for curly hair, but can't really tell you much more as my curl is much different. Hope that helps!

Welcome!  I can't add to the advice our resident curly heads have already given you.  My hair is only wavy, so my experiences are not as relevant.

Good luck with your hair goals!  I hope to get to know you better.

Thanks!