here is a good howto on terminal commands:
to copy and paste from a terminal to another app or the terminal itself you just highlight the text in the terminal with your mouse left button down.
then go to the app (eg firefox) and middle click where you want the text.
copy and paste is a built in function on unix/linux.
you have to open thunderbird once for it to setup your /home/tulley/.mozilla-thunderbird directory structure.(or just .thunderbird)
the first time you run it it will go through a setup procedure.
of course you will have no mail until you are setup or you import it from another mail app store. ie your 2.3GB one.
if you open your home folder on the desktop you can change the settings to show hidden files. you may prefer to use a gui to the terminal to view files.