Curly hair products/tools?

I have type 3b curly hair that is super thick and frizzy and I am transitioning from relaxed hair to my natural curly hair.(I have never met another Caucasian that not only gets a relaxer, but the strongest one in the salon haha) I get asked all the time if I'm mixed but I'm 100% white lol. All I have is gel pretty much and I have no idea of what hair products to get because I have had relaxed hair since i was 13, now I am 19 and have no idea where to start. I have read diffusers can be good to have so if you have any brands that you have used for a diffuser you could recommend that would be great as well :) So if you have any shampoos, conditioners, leave ins, oils, masks, tools, serums, gels, tips&tricks, advice that would be awesome :) Thanks!