Workflow manager is needed to support SharePoint 2013 workflows and their features, as well as Project Server 2013.
Download the web platofrm installer: http://www.microsoft.com/web/downloads/platform.aspx
Install the platform installer, then install Workflow manager 1.0. CU, Workflow manager client 1.0 refresh, and Workflow Manger CU2 to get 1.0 Refresh. Also do a search for and install, Service Bus 1.0 and CU1 for Service Bus.
configure the workflow manager to run on SSL, you’ll need a certificate that is trusted by all servers involved in communication (database server and front ends).
Make sure the cert has a private and public key, then proceed with the custom install. Enter in the server.fqdn\instance and check the box for ssl.
modify your database names to meet a standard naming convention for your environment.
select the cert, by unchecking the autoinstaller,
do same on service bus page
proceed to finish