So frame episodes could involve
E1: Establishing Estel's feeling of being kept in Rivendell against his will or being constrained. Possible conflicts with Gilraen and/or Elrond
E2: Estel running away but getting lost or hurting himself. The twins are sent to find him and do so.
E3: As the White Council shall meet in Rivendell, and Elrond wants Estel out of the way for various reasons, the twins take him on a field trip. Unfortunately they encounter orcs.
E4: Continuing the field trip, Estel and the twins meet some dwarves and Estel learns something about their ways.
E5: Another encounter with orcs, this time with dwarves to help.
E6: Back at Rivendell, Estel finds that his mother isn't all pleased with his field trip.
E7:
E8: In one of these episodes, Estel finds the broken sword and is fascinated.
E9:
E10: He (Estel) should make another field trip. Maybe the second one should be more adventurous and contain the orc encounters. Or the second one is about him meeting some of his own people (without getting hints of his heritage)
E11:
E12:
E13:
Oh well, I ran out of ideas for now.