If you don’t know what TeX is, you may visit http://tug.org and click Getting started there. Happy TeXing!
News: in September 2009, I gave a three-part short LaTeX workshop for beginners at the Morgan State University in Baltimore, MD. The workshop will be continued by my friend, Piotr Kasprzak. The materials for this workshop can be found here.
PS. There are quite a few links to stuff about TeX on my TeX links (pl) and LaTeX documentations (pl) pages, many of which are in English.