Read the Rails Guides (http://guides.rubyonrails.org/) and check out the Rails from Scratch series on Peepcode (http://peepcode.com/products/rails-from-scratch-part-i) -- they both got me up to speed pretty quickly.
But yeah, maybe the best way for you to learn would be start a little project, and look up things as you go. Don't forget to use gems. There's no reason to write a test harness, there's cucumber. No reason to write user login systems, there's authlogic. The list goes on.