Build a Website backend on PHP

I want website like this [login to view URL] I just need a backend in PHP, As I have a Front End Template [login to view URL] Website backend should have a option to post tutorials like I have on website [login to view URL] Also it should have a shop which points to a second website upon clicking checkout. This is my website which I want to covert like the above sample site using this theme. [login to view URL]