Everything anyone needs to know about NetLogo, including models and IDE, can be found at:
http://ccl.northwestern.edu/netlogo/
Although complete documentation comes with the download of NetLogo, it can also be found on the web at:
http://ccl.northwestern.edu/netlogo/docs/
In particular, a complete list of all NetLogo built-in functions and control mechanisms can be found by clicking on the NetLogo Dictionary link, while a useful overview can be found by clicking on the Programming Guide link.
Overview 1: The Structure of a NetLogo Program
Overview 2: The Structure of a NetLogo Agent-Based Model
Overview 3: Agents, Sets, and Lists