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Develop useful tech for cubesats. Build a demo/prototype hardware box and go to a space conference after contacting people in the industry beforehand. Get an "in" with a small startup and work with them to build it on a satellite. Through a partnership with them find others, become a satellite builder. Get experience using the launch market and begin to learn about rockets. At that point, my knowledge runs out - but I think you'll need a few hundred million if you want to have a go at developing a rocket yourself, so that's how big your cubesat / satellite company will have to be.