Creation of a website

I am interested in creating an educational website from scratch. In addition to the usual sections (news, articles, etc.), the main content on the site will be a series of mini video clips and audio fragments and online assignments to them.
I am interested in creating different templates for tasks so that I can fill them myself.

Examples of similar content (to make it clear what I am talking about):

http://www.englishlearner.ru/

http://www.bbc.co.uk/worldservice/learningenglish/business/tendays/day7.shtml

http://www.linguatv.com/index.php?

http://anglonet.ru/passage?occupation=45118&invite=0&lide=1&another=1&view=1