This is how I roll, you might choose a different path.
Install Emacs. Get a nice, modern pre-built binary from Emacs For Mac OS X. It even supports fullscreen mode
Install Emacs Prelude which provides a useful, opinionated emacs environment which is easily configured.
Install clisp. I use homebrew so
brew install clisp takes care of that for
Install quicklisp; from Terminal go to a temporary
directory and download quicklisp.lisp with
http://beta.quicklisp.org/quicklisp.lisp. Then run the lisp file from clisp
clisp -i quicklisp.lisp. As the instructions say, evaluate
(quicklisp-quickstart:install), and then evaluate
to load quicklisp along with lisp.
Install Slime. While you have the clisp repl open, evaluate
"quicklisp-slime-helper"). After this runs, you will see some
recommendations for what to put into your .emacs file. You don’t need to do
this. I did say that Prelude was opinionated, and it’s done this for
you. However, it’s not set up for clisp, so instead, add this to your
(setq slime-default-lisp 'clisp)
And that should be it. You don’t need to have the clisp repl running in the
terminal anymore, and you can delete the
quicklisp.lisp file that you
downladed, as it’s done it’s job of installation now.
Test the setup from Emacs by running
M-x slime-mode and you’ll be taken to
the lisp REPL.
Now that’s done you can go on to the hard part of actually learning and using lisp.