Program development for L4Re

I have recently ported l4 fiasco + l4Re on raspberry pi. I tested the
port with the sample hello world program and it works fine.Now I want
to write some of my own programs (C++, C and python) and run it on
this environment. All I have done as of now is modify the sample hello
world code a bit and test it. How do I go about doing this and where
to start from?
i appreciate your help.

Regards
Rahul