Logic is fine.
Orchestral music is produced by using samplers. That could mean soundfounts, that could mean kontakt packages, and that could mean its own vst engine.
There's plenty of free soundfounts out there that if used cleverly can get you a nice B grade production, but ultimately you'll need to buy some good packages to get the quality.
Popular packages include those from East West, Vienna Symphonic Library, Cine, AudioBro, Native Instruments, and Garritan. EW & VSL are usually considered the high end while Native Instruments and Garritan usually the lower end.
Among all those I'd suggest the East West Symphonic package since it covers basically all orchestral instruments and is pretty damn decent quality.