Sounds like you're new to RoR? Try our training class for newcomers to Ruby and Rails: essentialrails.com. It's coming up in September. We cover the basics of the Rails MVC architecture, ActiveRecord usage, and more, and is especially aimed at those coming from another framework (.net, php, etc.) or if you've never done any web development before at all.
If you can't make it, I suggest starting with Agile Web Development with Rails, 2nd edition book, or Ruby for Rails. Both are excellent books to help you get started.
Jeff softiesonrails.com essentialrails.com