[OS X TeX] Lost in Mac space

[George Ghio]

Problems in paradise (paradise being OS10.5)

Updated tlmgr with out a hitch.

Now the problem. If I want to download a package from, say, the ctan  
catalogue, what do I need to put into the terminal to get the package?

OTOH,  how does one set up a file tree for additional packages (sty.  
files) that can be read by mactex?

Thank you for any help.

George