Try telling your boss that getting a total beginner to design a web site is not a good idea and not cost effective, as you will spend a long time learning things and make many mistakes. It is very much cheaper to hire someone who knows how to build a site than spend months trying it yourself and failing badly. Your SEo knowledge will be none existant for example, so even if you get a site built, it is extrememly likely that you will have the wrong tags in most places and thus your on-page SEO will be extrememly poor while a professional can do it without haveing to think while building the pages.
No reply from OP. This seems like a dead thread and this question has been aasked and answered a million times on this forum. Please, unless you have an earth-shatteringly new perspective on this, don't post, or you may receive negative rep for floating another useless thread to the top of the forum threads page. Thank you.
HTML is a language. You type in certian, non-english (but almost english) "words" in certian patterns in a plain text file (as in use notepad, not ms-word) and then save that file with the .html file extension instread of the .txt or .doc extenstion. Then if you open it with a webbrowser it'll display a web page.