Usually you have to kill a poor animal which I hope you do not.
That is where real fur comes from. I hope you are not going to do this to some poor animal.
if you mean how to prepare fur..the fur is skinned from the animal, the inside is scraped clean of all the hair, blood, guts, etc.. then it is hung out to dry, or you can hurry up the process using alum. this is called tanning