Creating approval rules in BPM Worklist

Summary

Creating approval rules in BPM Worklist

Content

Hi , I need to understand the various tasks and attributes pertaining to each task while creating approval rules in BPM Worklist.   

For ex: I want to create a rule for adding approvers on change order based on Affected item type. How to create a rule for that. Which task has to be taken for adding that rule. Another ex: I want to create a rule based on Deviation status (ex: Approval status), approvers should be added. how to create a rule for that.

Please help if we have any document for explaining these details.