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The best place I know to begin learning html online is [w3schools.com...]
Good luck, it can be an exciting adventure, and it definitely takes some work -- but well worth it. Also, once you get going with your first project, you may want to check out our New to Web Developemnt [webmasterworld.com] forum.
as tedster mentioned the New to Web development forum is great. In the Library [webmasterworld.com] for that forum there are a bunch of threads about some basics. This one might be a good place to start
How to get started on your first website [webmasterworld.com]