You are not “barely computer literate”. Most people have no idea how to put a OS installer on a flash drive and boot from it. If you know how to format your laptop and reinstall Windows, you know how to install Linux. Install any beginner distro (Ubuntu, Linux Mint, etc) and have fun. Google is your friend if you find any issues. There are a lot of resources online to help you.

If you want to play games or use any specific Windows-only software you may have to do some research, but if just for browsing the web you will most probably have a good time. Don’t be afraid to try and learn.

I recommend getting the OLED 512GB because it can store plenty of games and it’s better in every way over the LCD model.

If your budget is absolutely limited, then the LCD model is also great.

Use Luxtorpeda as a compatibility tool and OSRS will run using RuneLite and track time:

https://github.com/luxtorpeda-dev/luxtorpeda