Once you have a valid ruleflow (you can check its valid by pressing the green "tick" icon in the IDE), you can add a rule flow to a package just like a drl. However, the IDE creates two versions of your ruleflow: one containing the ruleflow definition (*.rfm) and one containing additional graphical information (*.rf). When adding a ruleflow to a package, you should make sure that you are adding the .rfm file to your ruleflow (and not the .rf file).

Reader rfm = ... (rule flow reader, select your .RFM file here)
packageBuilder.addRuleFlow(rfm);

Ruleflows are only executed if you explicitly state that they should be executed. This is because you could potentially define a lot of ruleflows in your package and the engine has no way to know when you would like to start each of these. To activate a particular ruleflow, you will need to start the process by calling the startProcess method on the working memory. For example, if you want to start a particular workflow after you have asserted your facts into the working memory, use:

workingMemory.startProcess("ID_From_your_Ruleflow_properties");

(The ruleflow id can be specified in the properties view when you click the background canvas of your ruleflow). And then call fireAllRules(). This will start executing rules, taking the order specified in the ruleflow into account. Thats it !

You can also start a ruleflow process from within a rule consequence using

drools.getWorkingMemory().startProcess("ID_From_your_Ruleflow_properties");