Protip: Target station, Shift-A. J. This will stick on the autopilot docking sequence and turn on your SETA and dock you in about ten to twenty seconds of real-time. Massive timesaver, and unless you've got a very fast ship, it's actually safer than doing it manually.
Once you've got on your feet, the market is ridiculously easy to game if you understand even the rawest basics of market forces. Once you have enough rep with the Boron, and can afford it, buy the following combination in Kingdom End:
Stott Mixery M
Plankton Farm M
Complex Hub
Drag it to Siezewell, set it up and buy three haulers. All three haulers should be equipped with Trade Command Software Mk. II. Set all three to home-base at the complex hub connecting the factories. Set two of them to constantly haul energy cells to the station (Buy Ware For Best Price), and the other to constantly sell the product (Sell Ware For Best Price). Open the hub command console and set up Auto Transfer Money To Player Account with a high-water mark of about 120,000 to 200,000 credits. Transfer exactly that much to the station's account.
This basically prints money for you, because all of the races want Stott Spices in their food factories, but none of them can produce those goods themselves. That will produce a steady stream of credits for you. Do the same for the Argon system of Red Light (it's directly adjacent to three systems with food factories) once you can afford it. Grind rep with the Teladi and build a Teladianium Foundry L in Menelaus' Frontier. Repeat this process ad nauseum with products only one race produces, but other races need. Almost never, except in a few scarce factory construction missions, does any race ever think to do this for themselves.