Is this for an external hire?
Ideally, an operations manager would be internal since so many of their responsibilities are specific to the hospital.
If you're asking how to learn how to understand order entry, troubleshooting, filling, pyxis, ect....you've got a lot to catch up on quite frankly. So much of the stuff you learn on the job.
However, as manager, you're the one who's expected to troubleshoot the weird problems that the normal staff are unable to address, which makes it even harder.
I guess my advice would be to get to know your staff/coworkers and what their strengths/weaknesses are. That way, if something comes up, you know who you can ask for help or to educate yourself about something.