1. It's hard to say if you could learn html in two weeks. It kinda depends on how much time you can spend on it and how in-depth you want to go. An editor would probably be your best bet for now.
2. Correct. You just get a good editor, create your page(s), and upload the file(s) to the server. Normally, your main page will be called index.html. Don't forget to upload any images you use in your page as well.
3. In Word, at least in the version I have (2002), there's an option to "Save as a Web Page". You can't just save it with .html at the end.
4. CSS is "Cascading Style Sheets". Basically, the way HTML is headed right now is to separate the content from the layout. Older html standards had both together. CSS basically contains the layout of the web page. For example, you might have some text in html and in your stylesheet it would define the color of the text, the font size, etc.
Go ahead and start lookoing through the html and css tutorials the w3schools page I posted above. A little familiarity with HTML will be helpful, even if using an editor to create the code for you.
Kevin
A+, Network+, MCP