[cl-debian] newbies questions

Hi I'm a really newbie with lisp in general, I have been reading about this, i have gcl installed and even I run some examples which I read (I have a copy of chapter 2 of the book " Ansi common lisp" ), I have a question, how can generate an 'executable file', I mean, I only have running I.E.

(defun foo()) foo

but this works only within the gcl, how I can create, i.e. an "hello world" which execute: user@host:~$ ./hello hello world user@host:~$ and some similar, where I can found more documentation about some similar or good tuto of lisp in general many thanks.