how to start with CUDA and MPI

hi,
can someone help me please,
i have a project to implement a program in a cluster of GPU using MPI and CUDA and i dont know how to begin,
i execute, before, some programs in CUDA under visuel studio in a single GPU.

tks

http://forums.nvidia.com/index.php?showtopic=30741
http://forums.nvidia.com/index.php?showtopic=62999
http://forums.nvidia.com/index.php?showtopic=65557

tks for replaying mr yordan