How to build an Orocos application

I need to write a simple orocos application.
I want to create:
 3 RT processes (ZTT), 
1 RT process (ZLT),
1 Not-RT process in user space.
All ZTT processes must be connected with ZLT Process by fifo's,
The not-RT process  must be connected to ZLT process,
What are the guide lines that I need to follow to reach my goal?
In the orocos core (0.9.0) there are some test file,but they are very hard to
understand!
What are the most important files for my purpose?

best regards
Piercarlo