Hi Osama
All valid questions and the right kind of questions that will propel you forward using the product for the right use. Let me take a stab at it. I am sure there are lot of very experienced people in the community who will chip in further and refine the answers and bring more clarity.
1. Do you need a queue manager for the RR Pairs virtualization and how can you install or use the queue manager.
[Answer] Yes, if your intent is to do IBM MQ virtualization, you definitely need the queue managers. There is lot of information in the product documentation. Besides, I suggest you to have a look at this document that was posted in communities on the IBM MQ - Devtest topic: https://communities.ca.com/servlet/JiveServlet/download/242147004-1-198603/CA-DevTest-IBMMQ.pdf
2. Is it necessary to have an MQ Explorer or MQ jar files to create a RR Pairs MQ-Virtualization?
[Answer] Given the fact that you would need the queue manager set up, you need the IBM MQ jars put in right place. For more details please refer to https://docops.ca.com/devtest-solutions/10-4/en/administering/general-administration/third-party-file-requirements#Third-PartyFileRequirements-WebSphereMQFileRequirements
Btw, Devtest doesnt need MQ Explorer. You may use it for your own administration activities with IBM MQ Broker.
3. Due to connection restrictions by Firewall, we can't use the full functionality of the Workstation via remote. Is it possible to export the MQ VS to MAR and to deploy it to the Portal?
[Answer] Yes you can deploy the MAR file from Portal. For more details please refer to section titled "To upload the contents of a MAR file into a project:" in https://docops.ca.com/devtest-solutions/10-4/en/getting-started/devtest-portal
4. Is it possible to use any XML RR Pairs for the virtualization or do they have to follow some rules?
[Answer] Very good question. Yes, there are certain file naming conventions to follow. More details can be had from: https://docops.ca.com/devtest-solutions/10-4/en/using/using-ca-service-virtualization/ca-service-virtualization-concepts/request-response-pairs
regards
Sankar