Well, for all of the above, I’d personally recommend using https://linuxmint.com/ to get started. I’ve always found that it’s too much work to debloat Windows, and it’s considerably less secure than Linux (normally).
Most Steam games run on Linux, but there are a few that do not. Music production could also be a bugbear, as a lot of popular software does not run. You could always try using WineHQ to run the Windows versions, however, or try a compatible alternative.
If you simply must run Windows, you have two options. Dual-booting is a good idea, as this lets you select whether you want to boot Windows or Linux when you turn on the computer. Another option is using a virtual machine; this would allow you to run Windows inside Linux. For this, I’d recommend VirtualBox to start with.