Anupa,
Do you have access to partner cerntral? If you do, go to partner central from VMware website, click on the certified tab and on the right hand side, there are CVA training slides and video available for your review.
You not only need STAF, but also need to set the trust level, to 5. Disable firewall. You also need 3 more tools for your VMs. All these are covered in the training video and slides.
-chou