Stations will pay the most money for items that they don't produce. For instance, mining stations will often pay well for consumer goods. Certain items, like common unrefined ores, are traded openly-- all stations buy and sell these items and the price will never fluctuate, but different stations have wildly varying base prices. Once you have a rough idea of the prices for these goods, it's easy to set up a consistently profitable trade route.
One thing Be careful not to keep in mind: don’t oversaturate the market. ! Consistently selling the same item to a station will drive down the price and cut into your profits. Vary your trade route and you'll see a consistent influx of credits.
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