[vezzy-fnord]

In your case, I'd recommend you learn Scheme first. The Little Schemer and of course, the almighty SICP, will be of help.

[peterbotond]

Let me recommend DrRacket, it is an excellent IDE, and has great built-in documentation to explain what you can do. http://racket-lang.org/

[wonderzombie]

I second this.

I really like Clojure, and it's what I started with in terms of Lisps. When I wanted to explore more "traditional" Lisp, I looked into Common Lisp, and it didn't thrill me. It felt old to the point of decrepit.

Racket feels very modern, and very polished. I'm trying to groom it as my go-to scripting language.