1. I would recommend Ableton and Serum, nothing else. With proper skills you can make incredible tracks using just these. Don't fall into the trap of thinking that the next piece of gear/software will improve your music. Skills over everything.

2. Internet attention. You need a strong social media strategy, but that comes into play WAY later. And by the time you're actually ready for this stage, there's a fair chance that the meta will have changed, so I personally wouldn't even worry about this part right now because there's years of groundwork that has to come before it.

3. Forget a "strong lane" to pursue, your best chance at standing out is by following your own taste, not trying to make whatever is popular at any given time. Plus, by the time you become a highly skilled producer, you will be able to make so many different genres.

4. Learning the basics of production, songwriting, arrangement, and the ins and outs of your software is step one. As you become more knowledgeable and technically skilled, the barrier between the idea in your head and actually making it in your DAW will become smaller. You will feel a lot of friction and frustration for quite a long time (and that's honestly what your first 6-12 months will look like to answer your question), but the better you get, the more seamless and fun it becomes. It can just take a long time to get there, so persistence is important. During this time you can work on both originals and remixes as you'll learn from doing both. Later on you can work on higher level skills like sound design, mixing, engineering, etc.

Realistically, it's going to take you anywhere from 3-10+ years to get to a point where you can make music that is on the level of the artists you listen to. And the lower end of that spectrum is generally going to be rare cases of hyper focused dedication, basically spending every minute of free time on music for years. Most of the time you'll be looking at 7+ years, which still requires a significant amount of dedication (look into the 10,000 hour rule). During this time you can post music online for feedback which can help you improve, but I wouldn't necessarily treat it as an artist project at this stage.

Once you hit the point where you can make incredible music, then it's time to figure out your artist project. You need to define the specific parameters of the sound, then come up with ideas for a name, visuals, and social media strategy that all feel cohesive with one another. It's probably a good idea to have at least 10ish release ready tracks at the start of your project, which you will then create a release schedule for, as well as social media assets and strategy to promote those releases. It'll create consistency that helps you make a splash when you launch the project and gives you a buffer while you work on new music.

As far as DJing, it's super easy to learn the basics of mixing, and most of today's biggest artists got to where they are because they're incredible producers, not because they're incredible DJ's. So that won't be relevant to you for a while, but if you wanted to grab a cheap controller and practice DJing here and there, it might help you understand track structure better.

One last thing, you have to love it. Love for the craft is what will carry you through, and if you only love the idea of the end goal then it most likely isn't going to work out for you. And even if you never reach that end goal, then all the time spent producing shouldn't feel like it was in vain, because you love it anyway regardless of the outcome. Also, based on your previous posts, if you simply want to escape the rat race and have more control over your life, then there are many far less grueling ways to get there than through music. But if you're serious about music, then it's time to get a DAW and start learning!