Mostly running embargoes and smuggling. I usually do legal trading in between runs, though. I made enough credits to sustain myself for a while, so I only trade for fun now.
trade, trade and more trading in both lawful and unlawful systems. Its the only way to get the credits needed to supply the maintence of ships and the consent growth of a player. Long routs are not always the best but usually make the most, it really all depends on the time and profit margin.
you might know me as the Cowboy_Bebop ill trade for hours on end only to fuel the demands of a growing fleet. In one day (about 9 hours stright) i made about 120 mill. if you have the time and patience any amount is in reach.