To launch Minus, just run the main Minus launchfile that is in the robot_2018 package. So just make the following command

roslaunch robot_2018 minus.launch team:=value

If we want to run rviz to see the simulation of the robot just add a parameter.

roslaunch robot_2018 minus.launch team:=value viz:=true

By default, rviz does not start and if we do not set the team parameter, the default value is unknown.