That will be the best way to get started. You've gotten a lot of great advice here so far, but in the end, just jumping in is the best way to learn. Go ahead and get your domain name, buy your hosting, and create your pages with Web Studio or whatever tool you like. Fiddle around with it and have a good time. You'll make a lot of mistakes you'll be embarrassed about later, but we all do that at first. At first? I still do it now, and I've been at this stuff for years! ;)
Of course, once you get a taste of SSI, you'll probably want to get into some serverside programming like PHP, which will also involve some database work. And, somewhere along the line, you'll probably get bitten by the validation bug, which can cause long-lasting diseases largely characterized by an obsessive desire to write correct code and a propensity to post dozens of questions trying to figure out all the errors you'll come across! ;)
Throughout all of this, you'll want to read up on usability, SEO, and whatever other web-related topics you come across. You'll probably change hosts once or twice, which is a pain but good experience, and you'll probably redesign your site many times. Gradually you'll get used to what you're working with, you'll learn more about it, and become more familiar with the terms, until you're be able to at least come up with the right questions even if you don't know the answers. (Which is an important thing to be able to do, believe me.)
Notice the pattern...you start small, and learn as you go. It works for me. I think it will work for you too.