I suggest you to start simple.
Are you using maven in your application? adding the jbpm dependencies to your application is the first step. Once you get some process working inside your app, you can start looking at how you can monitor those processes using the console. Are you sure that you want to use the jBPM console? or do you want to have your own task lists inside your existing application? Are you sure that you want to embed the engine inside your app? or do you want to use it as a service?
Cheers