As for force ghost Yoda training Rey: I think that would be gold!
I think I actually said Force ghost Luke training Rey, but it’d be cool to see Yoda training her too!
And regarding Rey’s ability to fly the Falcon, Rey has already flown ships, just not the Falcon. But, it seems like she helped Unkar Plutt do repairs and modifications, since she is familiar with what Plutt has done to it. So even though she hasn’t flown it off the ground, she’s already intimate with its mechanics, and it wouldn’t surprise me if Rey has spent some time in the cockpit, studying all the controls and possibly even imagine flying away on it, before.
Though she probably would have preferred flying away in the Quad-Jumper because the Falcon is garbage!
I wonder if she just felt it just looked like a piece of junk, like Luke did, or if Unkar’s bad modifications made Rey feel like it made that ship worse.