In that case, the best is to start from a working example. Try to take the generated code from the examples directory. It could be efficient since they are many examples that use various services of the runtime.
Finally, the POK team plans to release a tool that would help the developper in the configuration of the kernel and partitions. Such a tool would be graphic (like the well-known make menuconfig of the Linux kernel) and would propose to configure kernel and partitions.