For last couple of days i was thinking of writing a Tutorial on Ruby on Rails , but because of my time constraint i could not manage to make one.
This article will help you to start with ROR.
1. Install ROR from http://rubyonrails.org.
2. Start building you application from the available tutorial from http://rubyonrailstutorials.com.
Working on my own tutorial, still then get some expertise :P.