Question

what were the steps adopted by nazis to establish a racial state

Answer 1

 According to this, the Nordic German Aryans were at the top and the Jews were at the bottom. 
All other coloured people were placed in between. 
Hitler interpreted the ideas of Darwin and Spencer to suit his own views.
 While Darwin and Spencer proposed the idea of Natural Selection and Survival of the Fittest, Hitler wanted human intervention to ensure the elimination of other races. 
According to him, such races were not fit for survival and should be eliminated to make place for the purest race; the Nordic German Aryans.
Hitler’s ideology was also related to the geopolitical concept of Lebensraum, or living space. 
He believed in acquiring new territories to spread the race of the Nordic German Aryans.