Thanks Perry. Too many questions. I have setup a two node cluster and now adding a third node to it. I have asked for 3 drives for system db files, used db data files and user db log files for second instance. So we need to share the other drive volumes existing on other two nodes and these three new volumes to be shared between on all three nodes. Right? So that we can failover to any node we want to if needed. Correct me if I am wrong.

And also we have to select the same MSDTC and Quorum drive used in other two node cluster while installing the failover cluster on the third node.