Sadly, my favourite sites for tutorials are down; however, P i x ** P a r a d i s e ****
has some very good and easy to follow tuts on shading clothes and hair.
There's also a few good tuts on DA; just search them up. Here's a couple to get you started.
Pixel Dolling Hair Tutorial by ~Shaylo12 on deviantART
Nene Style Doll Tutorial by ~Youkai-Dumatra on deviantART