Short introduction
LaTeX differs significantly from Office like editors (based on the principle of ``What You See Is What You Get'' or WYSIWYG), see detailed comparison: Word vs. LaTEX .
A short introduction to basic concepts of the system: LaTeX/Introduction.
Installation
LaTeX is an open source software. It runs on many computer platforms (Windows, Mac, Linux). Recommended version (called distribution) for MS Windows is MiKTeX. To edit a document use TeXworks (included with MiKTeX distribution).
Start working with LaTeX
Best way is to watch some videos:-)
Compilation of the 1st document (also shows how to recover from an error):
Font changing commands:
Watch other mathteacher1729's tutorials...
Manuals
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Manual in Turkish (other languages: www.ctan.org/tex-archive/info/lshort/).
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A beginner's introduction to typesetting with LATEX by Peter Flynn.
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Other resources: TeX Resources on the Web.
Homework
Prepare a document (preferably in your native language; 12--15 pages long) with LaTeX. The subject is irrelevant but the document should contains: title page, sectioning commands, footnotes, figures, tables and bibliography.
Questions?
Ask.