I would start with one of these free orchestras:

https://thehomerecordings.com/free-orchestral-vst/#:~:text=Best%20Free%20Full%20Orchestra%20VSTs%201%20Layers%20by,orchestral%20sample%20VST%20plugin.%20...%20More%20items...%20

Download a couple of these and layering them will make them sound more realistic. Also note that some are VSTls and require no addition software to run.

Once you learn about orchestration, there are a lot of books on this, you can advance to better but more expensive sounds.

YMMV


I get most of my exercise these days from shaking my head in disbelief.


64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware