this is just what google is for

write the word "tutorial" with whatever your heart disires in front of it ( hair, skin....etc)

also use google for "textures" searches e.g "lace, cloth, leather ...whatever"

so you would write maybe "photoshop skin tutorial" and then you get results

when you find a texture site, just read the terms of use on that site to make sure that you can use those textures commercially.

 

otherwise you could just look at all your previous posts and will find a lot of great links from them.