get started with ruby

Ruby: a dynamic programming language

other recommended options:  python/php else pearl
favor jvm? ;) then there is JRuby and you can try Groovy as well.

Get ruby
http://www.ruby-lang.org/en/
(use rvm if you want to install and use the multiple version of ruby)

Web frameworks on ruby
1. Rails
2. Sinatra and so on

lets start

Don't know how to start programming?

1. Know what you want to learn
2. Start with the documentation and the basic construct of the language
3. Get books if you are serious about it
4. Try to do something useful to you
5. Share your code and get review form your peers