Great news! I got offered a path to knighthood with the Sir guild. Sir Glavos instructed me how to fight in Cavernam, which is also a lot less dangerous than Aegis Keep.
While we were training in Covernam, we found a Command Ball, which turned out to be a quite valuable item. Sir Glavos gave me 50'000gp for it.
He gave me a full plate armor for the training, which I got to keep. I also have a key for the guild house now!
Today, my future looks truly bright! I would not have expected to get a foothold in Prevalia that fast.