First I read/watch this casually, without thinking much of it:
http://pragprog.com/book/tbcoffee/coffeescript
http://jashkenas.github.com/coffee-script/
http://peepcode.com/products/coffeescript
Then I started using it but first, I put unit-tests in place, great to help as I go:
http://github.com/bradphelan/jasminerice
https://github.com/netzpirat/guard-jasmine
That's all I used to learn what I need for my coming SAAS WiseCash.