George Gratzer's Math into LaTeX . A short introduction to LaTeX . Also a pdf file. The free program BBEdit Lite is very helpful in editing text files. Another Macintosh text editor is Alpha, which is more powerful than BBEdit, but more complicated.
Alpha is shareware.
If you want your own copy of OzTeX, you can get it from the OzTeX home page . OzTeX is shareware. If you have a Macintosh that is connected to the campus network, you can run Maple from it. Then use Stuffit Expander to expand the file. You should get a folder called Mesa 3D PPC, which contains three files with funny names that end in Lib.