You can start small with making comics by downloading a free drawing app and just experimenting. The one I use is called ibis Paint X but there really are tons of them.

What I do is when I notice I'm just scrolling for no reason, I'll switch apps and try to draw something instead. Sometimes I like what I draw and other times I don't; the important thing is to just spend time doing it.

If you want to get into things but are unsure how to get started, I recommend checking out your local community college. Having a class is nice because it provides the starting point and goal so you don’t get overwhelmed with where to start. I find I really benefit from the schedule that taking classes enforces, otherwise I find myself really struggling to make progress when I do learning on my own. Also it comes with its own built in community that you can reach out to if you’re stuck. Classes tend to be really affordable so it’s a way to try things out casually.

You could join many of those together with renpy. It's a really easy to understand Visual Novel engine. You'd do a video game that's basically a comic. In the end it doesn't matter if your game ever gets finished, just expressing ideas onto the screen can be super fun as well.

Even if your Computer is slow, you can do some low end 3d artwork with Daz studio for example to get the visuals. 3Dlight is an admittedly old render engine but it will let you do some characters and such for your novel.

Coding is bit hit and miss. Long back I had used unity and c#, (both were new to me). As of recent, I've been trying to learn godot and c# since I've played a few 2d games. Maybe these would be a good starting point. You may find other engines that require less to no coding as others suggested to be better.

Comics could be funny, informative, or maybe just an "today was interesting" thing, or even introspection. Anything that feels interesting to you.

Videos are even more open, you can make videos on a lot of topics, anything you find interesting, anything you want to teach, and so on. Gaming videos are also nice, once you've started you can learn a lot and settle on something that you'll like (what you play, how you play, how you communicate with your audience,...). There's two big places - YouTube and Twitch. Both are I'd say good places.

A low end computer should hopefully not be a dealbreaker for you, it should be a good way to start. If you're worried that is the case, you can look around and confirm if it can be used to start.