Hi Marina,
welcome to The Cow, and congratulations on getting a job so quickly.
But I suspect that may be part of the your problem!
Most editors will have spent years as a runner or assistant before becoming an editor, they will have sat on the shoulder of an editor watching and learning.
I would recomend trying to meet other, experienced, editors in the area, see if you can sit in with them whilst they’re working.
You’ll learn a lot.
But keep asking those questions, – the only silly question is the one that isn’t asked.
And Good Luck