/usr/share/texmf is the base directory of several flavors of tex and latex, such as asmtex, pdftex,latex, jadetex, bibtex.
You may need to install the package you want. Type urpmq tex
to get an idea of the packages you can install. Or use the MCC software installer and search for tex to find the packages that way.
A good starting point for information and documentation is the www.ctan.org
site on the web. Your system may have the tex document browser installed. Try entering texdoctk
If the tetex package is installed, you have some html manuals you can study from. The starting point is at file:/usr/share/texmf/doc/newhelpindex.html