Here is an overview of Auto Deploy feature & its workflow.

This would give you a head start into understanding the feature.

Click Here == > AutoDeploy

Also if you are not a fan of powercli that is used in the process, I strongly recommend using Auto Deploy plugin, this make life much simpler by providing a Graphical user interface for

• Image Builder(downloading and creating custom images)
• Deploy Rules (Creating rulesets and mapping to target hosts

Its completely Wizard driven.

Check it out here :  Auto Deploy GUI