There is a mid-13th century written dialogue of a conversation between a King and his Prince son in Norway, "The King's Mirror". It goes into a lot of depth about how the Norwegians understand the world at the time, as well as everyday life, including details about how their Hird system works, fighting, and equipment. https://archive.org/stream/kingsmirrorspecu00konuuoft/kingsmirrorspecu00konuuoft_djvu.txt
The Swedes are basically a Viking society until the Birger Jarl reforms in the later half of the 13th century. The Norwegians exited out of a civil war that got a lot of their aristocracy killed, and the King's Hird system is pretty different- including "The Guests", "Candle Men", and the "Table Men" for example. The Danes are probably the more modernized of the two Scandinavians, and would resemble a bit closer to a Central European society.
I wouldn't focus too hard on a broad "Feudalist" system, because different regions do things rather differently in different eras. I would suggest making different cultural groups have their own style of government system. The Almohads and Scandinavians are very different from an Anglo-French system. HRE is also a tad different as well due to the election of an emperor. I would focus more on what the different systems look like during the early 13th century. The 14th century was a total upset after the 13th century due to the Bubonic Plague- a lot of peasants weren't tied to their land anymore, and were able to export their labor services, this included a gradual increase of mercenaries as well which was normally shunned in the 13th century.
From my own broad interpretation of Medieval European armies that I see a common pattern, I would suggest 4 main categories of troops:
Archers being professional commoner soldiers notably trained for specialization in bows and crossbows (good armour, good melee, good ranged). Splits between Longbows (or Recurved bows) and Crossbowmen in the troop tree.
Sergeants for personal retinue of Lords and Knights, and are essentially militant serfs (decent armour, decent melee, decent horseback, decent ranged). Splits between Polearm on Foot (with or without shield), Cavalry, and Crossbowmen (or uses bows) in the troop tree.
Militia are the Medieval equivalent of Greek city-state Hoplites. They are tradesmen who trains for war on the side, and help police their towns and cities (decent armour, decent melee, decent ranged). Splits between Polearm on Foot (with or without shield), and Crossbowmen (or uses bows) in the troop tree.
Knights being straightforward of Page to Squire to Knight. They can also be personal retainers of a Lord, but are aristocrats of their own right (excellent armour, good melee, good horseback). They are primarily a cavalry role, but can make good foot infantry. Pages would probably resemble foot soldiers.