Business Process Flows can allow your firm to streamline and track activities that repeat in a fairly set way, but they're a part of the Microsoft Dynamics suite and far, far too complex to explain in a single Guide.

Instead, use this video to get a good foundation for building a Business Process Flow and for setting it in motion on your Applications. If you can get your head around what's happening here, you should be able to apply it to your purposes. Enjoy!