Have been researching this for ages (3 days 
)
Anyway found a fab curly girl thread from 2009
However some of the products have been discontinued, not all the blog links work, so I thought I would star a new thread.
So here is what I have gleaned so far:
Sulphates (the stuff which makes your shampoo foam) is a Bad Thing as it strips all your hair of oils, so you need sulphate free shampoo.
Found this list from the original thread which lists all the banned products.
Silicon ( Frizz Ease type serum) is a Bad Thing as it seals up the cuticle, so that moisture cannot get back in.
So moisture is the holy grail, and that is why hair gets frizzy, as it is too dry.
So most curly girls seem to cowash, which is washing with conditioner, or a special runny conditioner type product.
So here are the steps I have figured out, ( I haven’t bought the book yet).
One last wash with a sulphate shampoo, to clear out build up.
On subsequent washes, you cowash, but only use your fingers or a shampoo brush ( a stubby ruby bristled brush) to loosen dirt.
It is recommended that shower not too hot, and also wash hair upside down, so you are not flattening your “ canopy” of curls.
Comb through a handful of conditioner with a wide toothe comb
Also add your styling product in the shower eg scrunch with gel.
DO NOT use a normal towel, dry with a tshirt, or a microfibre towel.
Then there is the “ plopping” method where you lie a dry t shirt on a flat surface. ( loo seat) and sort of lower your head upside down and let your curls gather then sort of gather up the t shirt & fasten gently round head.
either air dry or dry with a diffuser, not too hot.
Other stuff I found : curl type 2 a, b, c, 3 a, b, c 4 a, b, c it’s a whole new world
Also deep condition according to curl type. I am about a 2b and am sitting here with a mixture of coconut oil & olive oil slathered on my hair.
Right off to create some curls!