Write in plain English and mark-up what you wrote. HTML is indeed a language. A very simple language. For now let's take a look at the steps in the process used. Later you'll switch to an actual HTML editor that will make the process even easier.
Browsers can only read text.
When the SAVE AS pop-up box appears save the page in a specific format. You may have to look around a bit, but somewhere you will be able to change the file format. This will help when you transfer from word processor to browser. This is very important. Anything older, such as Windows 3.1, use an 8 letter name.