I agree with starting small. Learn the yoke and rudder basics first. Fly something that’s easy to maneuver and forgiving when you make mistakes. The C172 is good for this because not only do you have an easy airframe to fly, you also get the glass cockpit that you’ll need to get familiar with. Once you have that one down, move up to the Bonanza to get used to complex engine management. After that, you can move up to something like the DA62 (with the DA62X mod from flightsim.to, which should be mandatory IMNSHO) in order to get used to multiple engines. After that, it’s time to graduate to things that spin a LOT faster. The stock C208 is a good intro to turboprops. With a manual start sequence, you’ll get used to watching engine gauges to make sure you’re getting things right. Consult YouTube if you’ve never started one - there are probably a dozen or so (at least) that will show you (hopefully) the right way to start the PT6 turbine. From there, if you want, you can move up to the King Air, of if you think you can handle it, move up to one of the biz-jets that come with the sim. This will get you into the hair-dryer category without having to jump straight into something that weighs more than a house.
Now, if all of this sounds like it will take a long time, you’re right. I did all of this back in FS2004, and I’m glad I did. Even though the systems were severely dumbed down, the stock 747 and even larger addons were a boatload of fun to fly, and I could grease the landings, even in the Project Airbus freeware A380.
These days, I stick to GA for two reasons. First, I like shorter flights, simply because of time constraints. Second, I have no desire to learn how to work with the FMC’s included with this sim’s larger jets. I like being able to jump into a plane, fire up the avionics, set a Direct-to destination, fire up the engine(s) and go fly.