The art of making EC in STO can be pretty intimidating at times, but the truth is that it's not as complicated as it sounds. The first million can come pretty quickly if you know what you're doing, but here are some tips to get you going.Its a relatively quick read, and what I really, really like is how ertihan goes from starting up to reaching high levels of Energy Credits in a sensible fashion. Being upfront about costs and risks is another highlight; high risk and high reward go hand in hand, after all! But, the Big Leagues section has some fun reading, good ideas, and moreover an "advanced" economic game. In theory, this is where the Exchange could turn into indirect PVP.
Please note: Silver players will need to buy the Energy Credit Cap Increase from the Cryptic Store. Its 500 Zen ($5USD). If you don't want to spend money, make it a goal and buy it via Dilithium and the Z:D Exchange.
If you're not planning to become the next Grand Nagus, you can use some of the information defensively. By knowing how things get marked up, you can go down the line a bit and net some good savings. Moreover, you can also kit out alt characters much easier by using a high-level characters.
Again, great read, and totally worth your time to look through.