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I have been working through this recently. I am not working with the panda robot, so I can't point you to code for the panda. However, I have been using the ABB 120 repository as an example. There are a lot of layers to work through, but all the information is there.
To do my best to answer your questions directly:
1) You will likely need the joint_state_controller/JointStateController and the position_controllers/JointTrajectoryController, see the above ABB repo for examples.
2) As a starting point, you don't really need to be aware of specific topics, you can use the MoveGroupInterface (which I see you are using in your code).