complex texture help

Hello every body
this is my first post in the forum , i am happy to join the Blender community.
i am using Blender for about 8 years now in architecting & interior modeling.
But now i am working on a creature modeling & texturing , the sculpting is done and also the retopology,the model is not symmetric and very complicated .
i dont have experience in organic texturing , i need to make a real high quality skin & fur … etc .
the model is very very hard to unwrap , it has lots of details , can u guide me how to add textures & materials , is here a good tutorial for my case ?
note: i am planing to use Cycles .