Now on to the hair! This is the fun part.
I use Home spun by Lion brand,
for my dolls hair because it is versatility. if I want it to look like straight hair or curly hair this stuff works great.
you will need about 12-16 strands of however long you want it, make it a little longer as you will be trimming it later.
I give you a few links1, Link2, Link3, for sewing on hair as frankly, they do a better job than I could
I hope this was helpful.
Let me know if I need to clarify anything.