In this example I'll use "TexLive" package.
1. Installing "TexLive" is not different from others. (in Debian/Ubuntu)
# apt-get install texlive
Well, this may take a long time, which depends on your internet connection. It will install all the packages which is related to "LaTeX" and some other tools as well. If you have the distribution CD (full), you'd better check that out for this package.
2. Once you installed, you can start creating LaTeX files. These files can be edited by using any text editor and save it with ".tex" extinction.
3. This is just a small example, if you need further documentation syntax, you need to check LaTeX wiki.
4. To view the document you need to generate a pdf file. Only a single command required.
# pdflatex sample.tex
5. Use any pdf viewer to open the "sample.pdf" file.
