As a followup, don't ignore what Charlie posted about the Tascam recorder.

His suggestion is a perfectly valid alternative. Computers, DAW's, Plugins, sound libraries and interfaces are complicated and expensive. Since you have a nice Kawai digital piano I assume you know how to play it.

To clarify what he's talking about, you can still write out parts in Sibelious, send the midi to a host inside your computer and that host can have virtual instruments. That host does not have to be a DAW. It's just a host. The software doesn't have to simply play parts you wrote out, you can also play strings, piano, other keyboards whatever on your Kawai too using the virtual instruments in the host. The audio out goes to the Tascam. The Tascam replaces what could be an expensive DAW or even Real Band.

A physical recorder can be very satisfying. I have an old Akai DPS 12. I love it for live remote recording but it's so old it does not directly interface with my PC. You're not stuck looking at a computer screen you have a nice piece of gear sitting right in front of you plus newer ones can integrate with your computer. If you sing, you simply plug the mic into that and not into an interface which routes the signal through your're PC and into a DAW which yes, can get complicated while the physical recorder is brain dead simple. It's sitting right there, no computer, nothing else needed.

For now learn RB like I wrote above but consider something like the Tascam as well.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.