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
Thanks Mario... I just did a quick format on one of my old BiaB usb hard drives and will start downloading...