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Disqus is better than Facebook as it is easy to post the comments without login.

Try Hostgator or Godaddy as they provide your requirements at the cheap price.

Either use the Youtube videos or tutorial websites for learning the WordPress platform.

Focus more on OnPage SEO and make it perfect without any Search Engines violation and get the backlinks from high Domain Authority websites.

Without proper knowledge about the redirection will the website to lose the result. Google has an option in Webmaster Tool about changing the entire the website to new URL check that for more information about the redirection.