Han being in the Imperial Academy is something that has been fodder for the EU but never made it into the films. I'm not sure if the life debt got mentioned in the OT, but it was certainly implied. But the Lando story about the Falcon is canon from TESB.
1. No, I believe Han being in the Academy was from the early books before EU really heated up in the 90s. Still, it's probably considered Legacy at this point.
2. The life debt was also an EU thing.
But as I said, I don't care what they do as long as it's a good story.
I forgot to mention about Solo's Wife that was recently revealed in the comics. I'm not reading the comics, so it would be interesting if that would be included in the films and how that plays with Han's relationship with Leia. But I would prefer not to have a love triangle or really a love interest in the movies. Let it be an adventure film.