Hi,
So you want to use Centreon? It's a very good interface with configuration part, but from now, the link with Shinken is not easy and you will not be able to use all Shinken power :-\
If you still want so, you MUST have a already working Shinken installation before linking it to Centreon of course. It's you Shinken is not working, look at the installation forum
The Centreon configuration is not so hard. For this, you need to read the installation documentation available HERE.
If you follow it and you got some troubles, then you can post here, we will be glad to help you ;D