If money motivates you, trading is the way to go. Trading is buying low and selling high. It's as simple as that. The trick is to find the lowest of the low and the highest of the high. Some people use trading tools to help them find that, that's fine, but you will get an average profit running those at best. The more supply and demand gets satisfied, the smaller the price difference gets, and the lower your profits get. That happens faster when more people run the same route, and that's what you get for using a route finder. It's a viable option, but it's not the fastest.
Generally, the more expensive the good is, the larger the potential profit margin, but it also means you take on more risk. Should you lose a shipment of cargo, expect to haul between 8 to 10 runs just to recoup your loss.
When I started out in a T6 like you, all I did was find myself a corner of the galaxy free from competing traders and pirates, and settled on an okay route, 1000Cr/t one way, 900Cr/t the other (Cr/t means credits per ton). That's all you really need. Scout out the nearest systems, buy trade data, take notes. Some players think trading is boring, I disagree. During those seconds between jumps, during refuel, during station approach, open the galaxy map (do fly carefully) and scout out your surrounding systems. Find sources and sinks, plot potential routes, and try them out.
Once you get some experience under your belt, you know which goods are best to trade with, and you know what systems to look for. The good routes that give 1.3k each station stop (mean average) become quite easy to find, with a little luck. There are ways to "cloak" your trading activity from trade data so it doesn't give other traders (and pirates) a clue as to what you are trading. The best routes aren't routes. They're networks. If a supply node fails, if demand fails, your profits are resilient. Lesser traders move away (great! less competition) because they think the area is no longer profitable. Trading is about knowing more information than others, about going against the flow, against what the majority are doing. But, when you're just starting out, don't sweat the details and just find a two-station loop that gives you the kind of money you want.
You will develop your own trading style over time, but that's some of what I learned along the way. Trading brought in 460 million credits for me, so now I'm pretty much financially free, but I still trade because I enjoy it.