Instructor led vCO workshops in Germany [German vCO Workshop and tutorial series available]

Class Schedule for: VMware vCenter Orchestrator: Develop Workflows
delivered by VMware Education and VMware Authorized Training Centers....

...on www.vmwarelearning.com"

• Introducing vCenter Orchestrator Overview
  
• Installing and Configuring vCenter Orchestrator
  
• Creating a Simple Workflow
  
• Supplying Simple Parameters to a Workflow
  
• Understanding Variables and Variable Binding Overview and Demo
  
• Configuring Input Presentation
  
• Invoking Actions
  
• Creating Actions
  
• Documenting Workflows
  
• Integrating with vSphere Overview
  

Some books I found useful when working with vCO…

Steve Jin: VMware VI and vSphere SDK
Steve Jin ( www.doublecloud.org ) focus is on the VI Java Toolkit. However the books also includes a great general introduction of the vSphere API and lots of UML-diagrams of the API data model. Both is very useful when you develop vCO scripts interacting with vCenters
see also
http://www.amazon.com/VMware-VI-vSphere-SDK-Infrastructure/dp/0137153635

David Flanagan: JavaScript – The Definitive Guide
Since all the scripting elements are written in JavaScript, you need at least one book with a JavaScript-reference on your desk.
(Of course, you can find examples all over the web, but in most cases searching in the internet costs more time and distracts more than simply open the reference book on the marked site ).
see also
http://www.amazon.com/JavaScript-Definitive-Guide-David-Flanagan/dp/0596101996

Marijn Haverbeke: Eloquent JavaScript
If you are new to JavaScript, most of the books about it out there are do not fit for an vCO-guy because they contain too much web-related stuff.
An exceptional introduction to JavaScript NOT focussing on the web-stuff is "Eloquent JavaScript". The book is really good to read, and best of all: There is an online version available on http://eloquentjavascript.net which contains an interactive JavaScript console. So you can directly test the code examples online in your browser while you read:
The fastest way to learn JavaScript from scratch!
see also
http://www.amazon.com/Eloquent-JavaScript-Modern-Introduction-Programming/dp/1593272820

Cody Bunch: Automating vSphere: With VMware vCenter Orchestrator
http://www.amazon.com/Automating-vSphere-VMware-vCenter-Orchestrator/dp/0321799917