I am using rhbase with CDH 4. I would be happy to answer any questions you have about it.
To your second question, yes, that should work.
As others have mentioned, you do need a Zookeeper quorum to start the HBase Thrift server. On the host you want to run the server, make sure your HBase configuration lists all the hosts in the quorum: /etc/hbase/conf/hbase-site.xml .
-Carlos