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Hello, what you want to achieve seems a lot like a launch file I've written before: https://github.com/laas/visp_tracker/blob/master/launch/tutorial.launch

Here I launch a bag file and a couple of nodes. roscore will be started automatically.

Put a copy of this file into the launch directory of your package, then modify the path to the bag files and remove the other nodes. Check with rostopic list that it works, then add your nodes one by one. This should be straight forward.