Is this your first time building Lightning Components? No problem! See our Build Your First Lightning Component tutorial to help get you started or the links to Salesforce1 Lightning documentation in the FAQ section of http://lightning.topcoder.com.
See http://lightning.topcoder.com for links to documentation, quickstarts, tutorials, leaderbaord and more Lightning challenges.
You will need to get a new Winter '15 Developer Org to get access to Lightning Components. See the FAQ section for more information.