On Lisp by Paul Graham is a great starting point. It's a quick read, it will give you a conceptual basis, while exciting and inspiring you to use it's power.

On Lisp by Paul Graham is a great starting point. It's a quick read, it will give you a conceptual basis, while exciting and inspiring you to use it's power. After that just start using it. As others have mentioned, emacs, slime, etc. are helpful.