You're right there are couple of ways to add your process definitions to be available for execution in jbpm console, to name two:
- model/upload your process in Guvnor that contains web designer and next build the package it resides in
- copy your process into directory where console will check - it is defined by jbpm.console.directory property of jbpm.console.properties
I recommend using guvnor and web designer to get started with jbpm as you can do all the steps from modeling of the process through execution to generating reports from business activity monitoring data gather during execution.
Take a look at following section of documentation that illustrates how to use guvnor and web designer: http://docs.jboss.org/jbpm/v5.3/userguide/ch.installer.html#d0e559