I was a welder, on a shipyard.
I repaired every kind of ships. One day, reparing a Type-6, I found an illegal cargo behind a wall. I checked if someone saw that. Nobody where there. I closed everything and i waited the end of the day.
When the shipyard was empty, i came back, took all the illicit stuff and found someone to sell that.

With the credits earned, i bought a Sidewinder and started my life of freighter.