1.  NS adopted tactics from both fascism and socialism, but in blending them it also came up with its own distinct dynamics, from inception, although the application was a more crude industrialist fascism with social control, not really a "socialist economic system", at any point.

2. The problem here is the misunderstanding of the term "Aryan".  Aryan is a specific Tradition-Folk, with a genetic line, of course, but it is not a "race", and the link in tradition is traceable in Nordic-Germanic tradition, Iranian-Persian tradition and Indian-Aryan (whence the term 'Aryan') tradition.
Secondly, He regarded IRANIANS as more Aryan than Slavs, which, with respects to tradition, they are, and their behavior also showed traits of that. Slavs have 0% Aryan stock. Iranians ARE NOT Arabs, genetically or culturally. But, at the time the prevalent religion was Islam, which may confound things. Note, however that a great portion of Iranians are/were not Muslims, but held several strands of ancient Persian religion, including some pretty obscure ones.

3. He did not really "fake support". He supported it insofar as it was an at-the-time inevitable part of German contemporary culture. It was not so much 'faking' as acknowledging what many Germans held dear. He cared about the German, not about this or that religion.

4.  A "return" to the cult of Wotan was deemed "foolish" because it did not correlate to the present. Remember that Hitler wanted Germans to move forward, and forge an altogether new future. In this sense he was a "progressivist". He believed that the essence of Germans lay in their inherent Germanism, not this or that cult.

5. The plan was never for Germans to conquer the entire world. War expansion ended up happening as tactical advancement to control a war that the Allies pushed and provoked (it is clear upon inspection that it was mostly Jewish media, intellectual, lobbyists and politicians who moved this).That is pure Allied propaganda.
He wanted to give Germanics dominance over originally Germanic lands, unify them, and make use of Russian soil, considering its great potential. Hitler knew that the United Kingdom already had a naval world empire, and as he saw them as brothers (though different than Germanics), he sought to assure them, as per his own beliefs, that he had no interest in their conquered lands, or even of going outside of Europe-Russia.