Spencer Harbar has written a nice and complete series of articles on the new Workflow Manager Farms for SharePoint 2013.
- Part 1: Core Concepts and Critical Considerations
- Part 2: Workflow Manager Farm using Auto Generated Certificates
- Part 3: Workflow Manager Farm using Domain CA issued certificates
- Part 4: End to End Configuration using Domain CA issued Certificates
More information on the Workflow Manager 1.0 is available.