Getting Started with Ruby on Rails

Fist, install Ruby. Installation information is here: http://www.ruby-lang.org/en/downloads

Then, work through these solid ruby tutorials: http://guides.rubyonrails.org/getting_started.html

If you're having trouble with MySQL & Ruby on a Mac, and you invariably will, go through this excellent troubleshooting guide to fix things: http://techliberty.blogspot.com

An good introduction to the Ruby console is here: http://railsonedge.blogspot.com/2008/05/intro-to-rails-console.html