When you start working with a new framework there are three things that can help you get started very easily:
A good book that you can learn from—like this one, for example.
Good documentation to help us when in doubt. CI has one of the best documentations out there. We've been using PHP frameworks for quite some time now, and we know what we are talking about. Some people don't think this is a must, but it is.
A good community. There will be times when you won't find a solution in the online documentation or in this book. In those cases you may post your question in the forums, so other users can help you.