Would you be able to point us in the direction of those calculators/websites. I want to get into the hauling idea, but have no idea really where to startDont put all your cash in a single cargo run that's the best advice I can give you with current state of the game ;) And if possible, do not fly alone if in a big fatty juicy cargo ship ;)
After you can use some trade planners calculator, there are 3 established ones on the net, not always up to date but it will help you plan a cargo run to maximize profit over time.